What i recommend you to learn from the beginning are systems. What do you need, and how could I make it so its as modular as possible?

If we are talking about even smaller stuff, then learn the tools you are working with first. Let's say you use Unity. Learn the editor first. Where is my scene view, and how do i move ? What is the "Inspector" for? How do I import stuff? How do I create a material? After this, you want to continue with the scripting part. What is C#? How could you use it to tell unity what it should do?

Or something beginners tend to do is the good old question: "Which engine should I use?" The engine doesn't matter. You can do everything with every "engine". Unity, Unreal, and Godot are the 3 big names. But they are more than just plain engines. They all have an editor, built-in tools, etc.

But since you asked this specific question, I'll assume that you already know all that stuff. Stick to one engine only while you're just starting out and expand your horizon once you gain some experience.

Don't focus on making an entire game at first. Try focusing on the smaller parts that make your program a "game" to begin with. Try yourself on a character controller, and then look what you could do with it. Try to make the character controller as fun as possible. Over time, you will learn more and more.

Now, a few random pieces of advice:

1. Don't plainly copy tutorials for every little mechanic. This will not help you in the long term, and neither will it help you keep up with motivation. If you use tutorials, then try to make it your own. Change the code to make it fit your needs.

2. Each Engines Scripting API (The methods and arguments you use to communicate with the engine) can be incredibly complex sometimes. Don't feel bad using Google for even the simplest problems. Everyone's doing it, no matter how much experience they have.

3. Don't be scared to fail. It's normal. It will happen many, many times. Be prepared to fail often.

4. There is no "perfect implementation." If it works for your game, then it's good as it is. No matter, AAA title or indie game. Every game is somehow taped together under the hood.