Could use a "tl;dr guide" of sorts on how to use Android.

In other words… a “Use this to do that” guide. Or more specifically, how to customize it (Get rid of the wallpaper, use lower resolutions, set up apps to run on boot, permanently change scaling_min_freq, etc without the usage of third party apps) and where to find a decent/optimized version of it (Something like LineageOS?...