Seventh chords, chord extensions, substitute chords, II-V-I progressions, secondary dominants, turnarounds, tritone substitutions, leading tones.
This and more is what you learn when you study jazz theory. For playing jazz it’s almost unavoidable, but above all very handy, to get to know this part of music theory.
Everyone can benefit from these lessons, whatever your instrument, so everyone is warmly welcome. Would you rather focus on the broader basis? Then take a look at general music theory too.