How to notate chords
I wrote this extensive paper on the notation of chords, classical and popular style, some years ago. Most musicians find it very useful, but also quite complicated. You need at least a Bachelor of Music. Unless you are very smart and talented, of course.
It's a free download. However, it could be wise to study the free course Harmony & Chords first.
How to notate chords (pdf)
This is Version 4, published in 2017.