For small projects, Godot seems to be absolutely fantastic and it has a lot of tutorials for stuff like what I've posted, if you want to go larger scale though then probably Unity. Godot however despite being open source is quickly catching up and looking to be like the next Blender of game engines, they just keep adding stuff. Godot 4.0 is something you should probably check out and compare to Unity as they're adding quite a lot of stuff.
RE: Does anyone have a subject they're particularly stuck on with games development or a genre they want a write up for that there aren't many tutorials on?