10 Mistakes I Made Learning Unity Alone (Cost Me Years)

TL;DR: Self-taught Unity devs walk into the same traps I did, and they cost real years. I skipped programming fundamentals, skipped math, skipped data structures, and copy-pasted my way through for far too long. I ignored debugging, the profiler, and git, and I learned in isolation until I finally joined a community. This is the list I wish I had before I started.

If you could make a list of things not to do when learning Unity game development as a self-taught developer, I would tick every box. I picked 11 for this article, but I could write an entire book on how many mistakes I made. When I think about it, who knows, I might actually write that book one day just about my mistakes. I am a self-taught developer, I made so many of these while I was learning Unity, and I want to share them with you.

Table of contents

• 1. I didn't learn programming first
• 2. I didn't learn math
• 3. I didn't learn data structures and algorithms
• 4. I didn't learn game design patterns
• 5. I wasn't debugging
• 6. I wasn't using source control
• 7. I wasn't using the profiler
• 8. I was procrastinating
• 9. I wasn't reading other programmers' code
• 10. I was learning in isolation
• One last piece of advice
• FAQ

1. I didn't learn programming first

The most important thing in Unity development is programming. If you are an artist, you will barely make a game, because you can't program. Even with AI, it is almost impossible unless the game is super simple. Some people get lucky and ship without programming, but I am talking about the average person trying to build something. If you know programming, you will make a game. Even an ugly one, you can still ship it.

I didn't understand this when I started learning Unity, and it backfired. I was more of a hacker than a programmer. I could build simple prototypes by stitching together tutorials and Stack Overflow scripts, but the moment I needed something custom, I was stuck. You can find a jump or run script online, but you won't find a complex inventory system built for your exact game. I was limited by whatever I could copy, and this went on for years. I wrote the full story in How I Learned Unity the Wrong Way, and put together a cleaner path in How to Actually Learn Unity in 2026 in the Age of AI. For the opposite mistake, grinding C# before you ever open Unity, I wrote a separate piece: Why "Learn C# First" Is Bad Advice for Unity Beginners. If you want the positive flip side of these mistakes, the habits I would build today are in How to become a better Unity C# Programmer in 2026.

The fix is simple on paper. I learned programming. The reality was harder, because after years of hacking my way through Unity I had a lot of bad habits to unlearn. I went back to the basics, started from scratch, and read everything I could find about fundamentals until the language actually made sense to me as a programmer, not a copy-paste hacker.

The bigger shift was how I learned. Before, if I had to use something like Addressables, I would watch a video or two, skim the docs, and build whatever was workable. Later I gave myself permission to spend days on a single feature if I needed to. I read the documentation end to end, I looked at the intent behind the design, I built small demos to try things out, and I read forum posts and opinions from other programmers until it clicked. Feature by feature, I got way better. In job interviews I could explain small details most interviewers did not know themselves, and a few of them were genuinely shocked by how deep I had gone.

2. I didn't learn math

If you have ever Googled "do you need math for programming", you have seen the same answer I saw. "No, you do not need math at all. I have been programming for ten years and I only use basic arithmetic, addition, subtraction, multiplication, division." I believed it. And to be fair, that answer is partially true for a lot of software jobs, but it is not true for a game developer.

I lived with that belief for years, and it showed the moment I needed any custom logic. Something as simple as rotating a turret around its axis was beyond me on my own. The scripts were available online, so I could copy one and get it working, but if those scripts did not exist, would I have been able to write it myself? Probably not.

Math for game dev is not that difficult, unless you are building something complex from scratch like a physics engine, which will rarely happen in your career. Most programming languages also ship with math functions I did not use before, and only later did I realize how useful they are. I used to write if/else statements to limit a value when a single Mathf.Clamp would do the same job.

Back to the rotating turret. The way I think about it today starts with the Pythagorean theorem, and I want to be clear that this is the under-the-hood view, not the code you actually write for a real game. The reason this mental model matters is that almost every positioning problem in a game is a right triangle. Between a turret and its target you have an x offset and a y offset as the two legs, and the hypotenuse between them is the longest side, which is also the magnitude of the vector between the objects, or what we usually call the distance. For the angle you pass the two legs into Mathf.Atan2(dy, dx) (note the order, y first then x), which returns radians, and you convert to degrees with float degrees = radians * Mathf.Rad2Deg;. That is the raw angle math behind every "aim at target" routine.

In a real Unity project you almost never write that full chain yourself. For a 2D turret you grab the target angle with Mathf.Atan2(dy, dx) * Mathf.Rad2Deg and feed it into Mathf.MoveTowardsAngle(currentAngle, targetAngle, rotationSpeed * Time.deltaTime), which turns the turret toward the target at a controlled speed. For 3D you skip the trig entirely and let Unity do it with Quaternion.LookRotation(target.position - transform.position) combined with Quaternion.RotateTowards or Quaternion.Slerp for smooth interpolation. The reason I went through the scratch math at all was to understand what Unity's Mathf functions are actually doing for me. It is like a calculator. The calculator does the math for you, but if you do not know which inputs or which functions to give it, you are still stuck. Unity's math library is the same. The helpers are powerful, but only if you understand them well enough to pick the right one for your problem.

3. I didn't learn data structures and algorithms

For years I was only using lists, and I did not even know the difference between an array and a list. I had heard the phrase "data structures" before, but I always thought it was something boomer developers did in C. I had no idea how valuable they were in real programming, and I had no idea there were more than the two I already used. I also did not know what O(n) time or memory complexity meant. I assumed computers were just fast now and could handle whatever I threw at them. This is not 1995.

The first time this bit me hard was when I built a user database for a project. I kept a copy of every user in a list, and as that list grew I used a linear search to look up a user by iterating through every entry until I found the one I needed. It got slow, abnormally slow, and at the time I had no idea why. The same thing happened when I ran a big for loop over a large dataset, the whole frame would freeze and the game would hitch, and again I had no idea why. I also did not understand how memory was working underneath me, which I later broke down in MonoBehaviour vs C# Class vs Struct, memory and performance. I had actually heard of Dictionary<TKey, TValue> and knew it existed in C#, but I had never used it, so it never crossed my mind as the tool for any of these problems.

The way I closed the gap was LeetCode. Most people use it to prep for FAANG interviews, but I used it purely to improve as a programmer, and the way I see code today is completely different because of it. When I teach students now, data structures and algorithms are mandatory at some point in the course, and we learn them inside Unity so the student is building intuition for programming and the engine at the same time.

What LeetCode actually trains is your thought process. You start reading code line by line, and that is the skill that matters most right now. People write less code than before because of AI, but you still need to review and read every line the model produces. If you never developed that thought process, you are just shipping a black box you do not understand. The difference between future developers and vibe coders is going to be exactly this, programming intuition.

4. I didn't learn game design patterns

I did not know about programming patterns or game design patterns at all. I had heard of the Singleton, but I did not know it was called a "design pattern" or that there was a whole catalog of them. Most of my code was one long chain of if/else statements. I had no idea you could abstract repetitive logic into other classes or methods, and I had never heard of code decoupling or SOLID principles. The code worked, but it was a tangle.

The clearest example was a project where I was writing enemy AI. For every enemy type I made a new class, SkeletonEnemy.cs, then VampireEnemy.cs, and so on. They all shared the same behaviors, patrol, spot the player, chase, return to patrol when the player was out of range, and die when health dropped below zero. Instead of sharing that code, I copy-pasted the exact same logic into every new enemy class. I had no idea inheritance existed. These days I actually avoid inheritance most of the time and prefer composition over inheritance. The one place I still use it is : MonoBehaviour, which is mandatory for scene objects, but that is about it.

As I wrote more code, I started to understand that what I was doing was not scalable. So I went online and looked for more optimal solutions to the problems I kept hitting. That is the moment I discovered inheritance, right when I was stuck with a pile of copy-pasted enemy classes. These days when I teach my students I actually make them hit the same wall on purpose, because most courses and tutorials fail at exactly this, they hand you the solution like inheritance or a state machine without making sure you feel the problem first. If you never felt the pain, the pattern just looks like extra complexity.

The other thing that changed me was a free online book called Game Programming Patterns by Robert Nystrom. I learned a lot from it, and the most influential pattern for me was the State Machine. It is still my favorite to this day, and I do not think most games can function without one. The idea is simple. If you have an enemy (I am avoiding the word "AI" because these days everyone associates AI with LLMs) and that enemy has multiple behaviors like patrolling and chasing, you do not need countless if/else statements to track what it is doing. You give the enemy one state at a time. While it is patrolling, that is its state, and only that state runs. The moment it sees the player and starts chasing, it transitions into the chase state. I recommend this pattern to every beginner, because it changes everything about how you design a game. Once you have it, you feel it in almost every system you build.

5. I wasn't debugging

Debugging saves you time, but I had no idea. The way I worked was simple. I would make a change in the code, wait for it to compile, hit play, and see what happened. If it did not work the way I wanted, I would change something else and try again. I literally guessed my way through every bug. I could spend an entire day in that change, compile, play loop, when a single Debug.Log() in the right spot would have pointed me at the problem in a minute. I just knew no better.

I learned this one by intuition. I just noticed that I was spending too much time guessing. I might have read it somewhere or someone told me, I honestly do not remember, but at some point I realized I should stop trying to guess what was going on under the hood. So I started using Debug.Log everywhere, and for the first time I could actually see the flow of execution through my own code.

I still do not use breakpoints, even though everyone recommends them and I recommend them too. The reason is that I spent most of my career in Augmented Reality, where you have to compile the game to a real device and read the logs every time you want to test something. The exact flow depends on the project, but that was the general shape of it, and Debug.Log fit that loop better than any IDE feature. People argue about prints versus breakpoints, and I am on the prints side, but I cannot say much about breakpoints because I have not used them enough. Breakpoints exist in every modern IDE, and if that style works better for you, go with it.

6. I wasn't using source control

In the beginning I did not use source control at all, and I did not even understand what it was for. I saved my projects on Dropbox, like a real developer. Lucky for me I still have the source code of my first game sitting in that Dropbox folder to this day. I did discover git later, but I used it sparsely and I was not disciplined about committing. I could manage git add, git commit, and git push, and that was about the limit of my skill. Merging anything was a death sentence. All of that sloppiness eventually caught up with me. I once lost an entire client project because it got corrupted and I had nothing in git to fall back on.

I had to tell the client what happened, and I got lucky because he was not a programmer. He thought what I described was a normal thing that happens to developers, and I did not correct him. I managed to rebuild the project from scratch without much trouble, because building something the second time is always faster than the first time. The real shift in how I used git came later, when I started working on real projects with multiple developers, where you cannot afford merge conflicts. I learned to write my code in isolation on a branch instead of randomly editing someone else's files, and once you get good at merging and solving conflicts, you get good at git. It is not as difficult once you get the grip of it, you just have to practice.

With AI in the loop, git is more important than ever. An AI agent can corrupt your project just as easily as a bad manual merge, so always tell your agent to use git and to create a repository if one does not exist, or set one up yourself. This is why I teach my students git on day one, and I forbid GUI git clients while we are learning. Privately they can use whatever tool they want, but while they work with me they have to use pure terminal git. As a side effect they passively learn their operating system too, and that is one of the most valuable skills a developer can have.

7. I wasn't using the profiler

For a long time I did not even know Unity had a profiler built into the editor. I saw the tab, but I never opened it. When a scene felt slow, my approach was usually to delete things until it felt faster again, or to blame the device instead of my code. This was especially bad during my Augmented Reality years, because we were targeting phones and mobile performance is unforgiving, but when a build ran poorly I would assume it was the phone and not something I had written. I would also try to "optimize" by guessing, tweaking numbers in the inspector or moving code around with no data to tell me whether anything I changed actually helped. The idea that you could open a single tool and see exactly which script, function, or allocation was eating the frame was completely foreign to me. I cannot point to one single project where this cost me a week, because it cost me smaller amounts of time on almost every project I worked on back then.

What finally forced me to open the Profiler was a Skeletons AR project I was working on, running on phones. I had hundreds of skeletons in the scene, and each one was running a find-nearest-target script every single frame. Once the wave grew, the frame rate would crater, and the Profiler made it obvious within seconds. There were huge spikes on my find-target function, because every skeleton was looping through every possible target and computing the full distance to each one, on every single frame. The first fix was to stop running this every frame and instead run it on an interval, so each skeleton only searched for its target every half a second or so. That alone cleaned up most of the spikes.

The second fix came straight from the math section, the Pythagorean theorem. To get the actual distance between two objects in Unity you compute sqrt(dx² + dy² + dz²), and sqrt is the expensive part. But if all you need to know is whether one target is closer than another, you do not need the actual distance at all, you just need to compare them. Squared distances compare the same way normal distances do, so you can skip the square root entirely and use (a - b).sqrMagnitude instead of Vector3.Distance(a, b). Unity even exposes sqrMagnitude on vectors for exactly this reason. Between throttling the call rate and swapping Distance for sqrMagnitude, the CPU spikes disappeared, and that was the first time I actually felt the connection between math knowledge and real performance work.

8. I was procrastinating

This one is not technical, but it is worth bringing up because so many new Unity devs suffer from it and I was one of them. I used to search for answers online for anything that felt hard, looking for a reason I could not stick with a project. For a while I convinced myself there was something wrong with me, that I was wired differently from other developers. The truth was simpler and less flattering. The real reason I could not make progress was that I was lazy, and discipline is a skill like any other skill. You have to practice discipline the same way you practice swimming or anything else you want to get good at. It took me years to actually build that muscle, and what I finally figured out was that I loved the idea of game development but I was not ready to sacrifice anything to actually make it happen.

What actually worked for me was realizing I never loved game development as much as I thought. I was never going to become the next Hideo Kojima, the creator of Death Stranding. I am more of a John Carmack type. What I really love is programming, and I stayed in game dev because of the challenge the problem space gives you. Once I accepted that, the discipline stopped being something I had to force, because I was finally working on the parts of the job that actually matched me. Today I am mostly focused on the programming side of Unity work, and that is exactly what clients hire me for.

After I found what I actually liked in game dev, which was programming, I also worked on my discipline. I know this is a cliche and everyone talks about it now, so I will not spend long on it, but the real shift for me was cutting distractions. That was my biggest source of lost focus. These days I do not even listen to music while I work, especially not something that hypes me up like Sabaton. I turn off all my notifications and all social media. I would delete the apps entirely if I did not need them for this blog. No scrolling, no YouTube binging, no Reddit. You dedicate hours to learning and building your project, with nothing in between. And no, this is not the part where I tell you to take cold showers, wake up at 5 a.m., or stare at the sun to fix your dopamine. Go do that on your own time if you want to. What worked for me was putting the phone down and doing the work.

9. I wasn't reading other programmers' code

For years I only read my own code and never looked at how other programmers wrote theirs. Reading other people's code is the best way to learn, and I was skipping it completely. On top of that, I had no idea who the top programmers in my field were, or the top people in any other field of programming. Imagine you play soccer or basketball and you do not know who Ronaldo or LeBron is. It does not make sense. That is exactly how I did programming for many years. I had no idea what was happening in the industry, no idea what was new in any Unity release, and no idea what was new in C#. I never opened an open source project on GitHub to see how a real codebase was written, and I never watched a single talk from a conference like GDC where the actual engineers behind the games I loved explained how they built them.

I do not remember the exact moment, but at some point I just started paying more attention. Infallible Code was really influential on me, because I would watch their videos and streams where they talked about actual work, tools they used, and systems they built, and I got curious. That curiosity is what eventually built the mindset. Just being aware of what is happening in your industry, hearing devs talk about tools, systems, projects, whatever, somehow makes you a better programmer even when you are not actively coding. These days I watch web devs, Rust devs, and low-level systems programmers, and even though most of what they do is not directly related to Unity, it has made me a better Unity programmer in ways I did not expect. I put together the full list of Unity channels that shaped me in My 10 Favorite Unity Tutorial Channels.

One thing I noticed is that Unity and game dev in general are heavily GUI-driven, to the point that the developers themselves build a GUI for almost everything. In web dev and most other areas, the terminal is almost mandatory, and it is one of the things most game devs miss. I am guilty of this myself. At one point I built SteamPipe GUI for MacOS because the existing SteamPipe GUI was Windows only, and the CLI tools were available on Mac but I could not confidently use the terminal. Looking back, I should have just learned the commands, but honestly the tool turned out great. You set up your Steam credentials and your output files once, and after that pushing a new build to Steam is a single click.

That is starting to change because AI tools have had a big influence on CLI workflows, and the terminal is back in the spotlight. Another thing I picked up is that when I use the terminal fluently during a screen share, I look more competent, and I leave the impression that I know what I am doing. Do not overdo it, by the way. People get jealous and it can work against you. Be humble when you work on a project. Team work deserves a whole article of its own.

10. I was learning in isolation

At the beginning I was never part of any community. I might ask a question on Reddit or the Unity forums once in a while, and that was it. I was never in a single Discord channel, I never talked to other developers about what I was working on, and I had literally no contact with anyone in the field. I did not even try to reach devs in my own country or any neighboring ones. I was just alone with my projects and my bugs for years.

The fix started when I began sharing more of what I was working on, and the feedback started coming back. The pivot point was posting my Skeletons AR game on r/gamedev, where the post exploded, and that was the first time I actually felt what a community could do for you. After that I started sharing regularly on Discord, LinkedIn, and wherever else made sense.

I also discovered that Unity has an official Discord server, and that was a huge unlock. There are channels for almost every topic, and if you have a question you will usually get a reply in minutes. Unity clearly cares about its community and has invested a lot into it, and I am genuinely grateful for that. If you are self-taught and isolated right now, that server alone can change how fast you learn.

If you want a smaller place to hang out, I also run my own Discord, which I built through my YouTube channel. It stalled for a while because I stopped posting on YouTube, but that is about to change very soon, so subscribe if you have not, and come join the Discord. I am there almost every day, and I will answer any question you throw at me.

One last piece of advice

Before I close this out, I want to push back on one piece of advice that new Unity devs hear constantly, usually phrased as "just make video games". This is one of those pieces of advice that is helpful and dangerous at the same time, and depending on where you are in your journey it can either push you forward or keep you stuck. It is a personal opinion, but I do not like this advice. It sounds positive and encouraging, and in principle it is true that if you just keep building games you will get better. The problem is that if you skipped the fundamentals of programming, you will not actually be able to build games, and the advice quietly falls short right there. I took it literally in my early years, and it is a big reason I made so many of the mistakes earlier in this article. My first three games were all built with this mindset, and even though I managed to finish simple games, I did not really improve as a developer while making them. Take this one with a grain of salt. And if you are asking the bigger question, whether Unity is even worth learning in 2026 at all, I wrote about that in Is It Worth Learning Unity in 2026?.

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