Look up the pros and cons of the different editors (Unreal, Unity, Godot). Pick one and start making the simplest of games. There's some good tutorials that can walk you through things.
As you learn, you will probably find a specific aspect that you like a lot and you can concentrate on building your expertise for that. Might be coding, animation, shading, 3d modeling. Who knows.
The important part is to start using the software, but really aim for simple stuff for now and use good quality tutorials and courses. I used mostly YouTube and some Udemy.
Depending on your age/savings, this can give you a good idea in what to study if this is an option.