For your consideration, this is the manual for KOMA-Script: https://mirror.las.iastate.edu/tex-archive/macros/latex/cont...
That's 552 pages worth of typography that only considers page layouting. It doesn't deal with fonts or kerning at all. It's actually a fun read even if just for the author's occasional frustration with how often laymen confidently ignore centuries-old typography rules that exists for a reason.