Whenever I try to create harmonies with my melodies, I'm always stuck to using common progressions (like I-V-vi-IV) and various 6th and 7th chords. I don't think that's a bad thing, per se, but I feel trapped using my current methods. Do you have any advice on how to venture into implementing more chords like suspended, diminished, augmented, and added/omitted tones?
that list of 'types' is not going going to get you anywhere musical. everything about the way that's listed is misleading. if your goal is to get to that list, then just put each one on paper and hang it on the wall. but if you are looking for new sounds, i'd say listen to a lot of music, and whenever you hear something you like, make sure to figure out basically how to execute everything that occurs in it. over time you will surely absorb a lot of tricks and techniques