You'd be amazed at what you can make! :) I am not formally trained, and picked up a tonne from doing (and youtube) - smarts be darned, I have fun! :) If there's a game you'd like to make or look into how it's put together, I find it to be a fun hobby definitely.

it's a very cheap hobby, as the big three (Godot, Unity, and Unreal) all are free to use (the latter two have commercial costs, but godot is open-source), so I love it for that too! :) There's no equipment needed either, I even have godot installed on my phone because I can! :)

I'm a unity dev, so that's my wheelhouse. Unity offer handy lessons to help you pick up how things work, but both godot and unity are okay once you overcome "whoah lots of things! send help!". I've not used unreal, but I gather the building-block scripting "blueprints" is easy enough. :)

Whatever you choose to get up to, hope you have fun!