Grounding resources

It seems that grounding and safety earth is one of the most confusing aspects of this hobby for beginners like me.
Here are some resources that I have found useful. I will add more as I come across them.

• https://hifisonix.com/ground-loops/
• http://sound-au.com/earthing.htm
• https://www.diyaudio.com/forums/solid-state/324413-dozens-schemes-wire-amp.html