Take for example man pages, I find the very comfy to read. And they have generous margins on both sides. About indenting, I try to avoid deep nesting, usually 3

Take for example man pages, I find the very comfy to read. And they have generous margins on both sides. About indenting, I try to avoid deep nesting, usually 3 is a maximum, very rare to need more, if the code has to be easy to read.