I'm an amateur musician who sometimes likes to write sheet music for arrangements and for pieces that I figure out by ear. I do this mainly because I can go long periods without playing and when I feel like doing it again, I like to have a custom reference to quickly relearn a song, however I feel like sometimes my sheets are written in a really messy way (not pleasant to the eye or confusing) so I was wondering if anyone knows of a style guide for sheet music writing that has some kind of worldwide reputation. I've found a couple ones online but I would like to know if I should be paying more attention for an specific one.
The go-to reference for notation is Elaine Gould's Behind Bars: The Definitive Guide to Music Notation. It's a massive book that, in addition to the standard tonal notation rules, includes examples of advanced post-tonal notation as well.
Other resources are listed in References for typesetting music, but the Gould is certainly the industry standard.
Lastly, Indiana University has a nice online resource here.