This is the answer IMO. Godot is lightweight, easy to use, and free with fully open sourced communities. Check out GDQuest for tutorials. The best part is that Godot uses a programming language called GDscript which is based on Python. I've learned so much about programming best practices using Godot that it translates to my day job now when I need to use python. I cannot recommend it enough as a hobbyist.

As an additional point, Godot 4 just released and it is really giving Unity a run for it's money with features and capabilities.