I would like to see some sources like this that are language agnostic that give you the tools needed to implement your own popular tool. For example, where coul

I would like to see some sources like this that are language agnostic that give you the tools needed to implement your own popular tool. For example, where could I look to find a written description of the way git works from the ground up? Kind of like a "guide to implementing X" type of thing, but without code.