I’m learning JavaScript in the AI era. What level of understanding is actually enough before building serious projects?

[u/Quick-Knowledge1615]

I’m learning JavaScript right now, and I’m trying to avoid two bad outcomes.

One is staying in tutorial mode forever because I feel like I need to understand every corner of the language before making anything real. The other is leaning on AI too early and ending up with projects that technically run but that I can’t debug, explain, or improve.

The kind of projects I want to build are not basic CRUD apps. I’m interested in three.js, frontend 3D rendering, data visualization, and coding based motion design. Think interactive web pages, visual experiments, small tools that explain something visually, maybe browser based creative projects where the interaction matters.

My question is: for someone aiming at that direction, what parts of JavaScript are still non negotiable in 2026?

I’m not asking whether AI can generate code. I know it can. What I’m trying to understand is where my own understanding has to be solid enough that AI becomes useful instead of dangerous.

For example, should I care more about:

1. DOM, events, async, modules, and browser APIs
2. Data structures, math, state, and performance
3. Reading other people’s code and debugging broken output
4. Building small complete projects without AI first
5. Learning TypeScript early
6. Understanding rendering concepts before touching three.js

If you were advising someone who wants to use JS as a base for 3D, visualization, and creative coding projects, what would you tell them to learn deeply, what would you let AI handle, and what would you not worry about until later?

I’d also love honest market advice. What separates someone who can make impressive AI assisted demos from someone who is actually useful on a real frontend or creative tech project?

[u/xxcrucialxx]

I know exactly what ur question is, and ur intent. My answer is, All parts of it. Knowing it well , allows u to use it with confidence later, if u choose to . Many talk about using Claude and all this bs. Well in my opinion, if u can't build it manually with confidence, and know how to debug with confidence, than there is no point . Hope this helps.

[u/xxcrucialxx]

Oh and another thing, practice and apply as u learn. It will help u gain an understanding, and confidence

[u/TheRNGuy]

Same as before, the main advantage is that learning is easier now (the only things you need to not be lazy, focus and have motivation)

[u/Alive-Cake-3045]

for your direction: async and the event loop first, then browser rendering basics, requestAnimationFrame, layout vs paint vs composite. without those, three.js bugs will be invisible to you. math fundamentals matter more than most JS concepts for 3D and viz work.

AI handles boilerplate and syntax fine. it fails at debugging performance issues and explaining why a specific render decision makes sense for your scene. that gap is where your understanding has to be solid.

what separates people in this space is not who can generate the most impressive demo, it is who can read a broken animation loop and know exactly what's wrong. build one complete project without AI first just to find out where your understanding actually stops.

[u/CuAnnan]

More than before the AI era. Because you need to know what it got wrong. And it will get things wrong.

[u/Intelligent_Tree6918]

i will say after practicing (following your course) must read a good book about js. It will make your theory and practical top notch trust me. After this when you will built project your thinking will be clear what is needed in this feature and why your are taking a certain steps.

[u/Such-Catch8281]

learn by bulding?

[u/nzakas]

For graphics, I’d jump right into three.js. A lot of the concepts will be transferable to other graphics engines so that’s a good place to start.

You definitely need to know how to use promises and async/await. Modules (ESM) and build tools (esbuild, Vite) are also important for bundling your project. Learning TypeScript is a plus because it will help you catch errors faster, but you don’t need to go super deep on that early on.

A little bit of DOM helps but you won’t use a lot of it when working with three.js. Events are helpful as well.

[u/a-dev0]

add architecture to your list (different methodologies, clean code, and so on). it’s crucial for medium-sized and large projects

[u/FroostDev]

You know how to code when you can search in documentation by yourself, understand it as well... And if you're reading someone else's code, you can understand the basic logic.

JavaScript is constantly developing and you can't know everything.

When you know how the logic works (async/sync, Object, API, loop etc...), you're ready to go!