poVoq I guess it would be nice to have a thread to share nice game dev tutorials. Here is one for making a 3D game in Godot:
TPW The best tutorial for C++/SDL I know of is the site of lazyfoo. Rudimentary knowledge of C++ is required. If you need this, this is a good point to start.
poVoq https://cassidyjames.com/blog/publish-godot-engine-game-flathub-flatpak/ Nice tutorial on how to package a Godot game for Flathub.
poVoq https://30fps.net/pages/pvs-portals-and-quake/ Nice deep dive into Quake like technical level design.