I love adding harmonic tension in my playing, especially in my solos (especially on my solos on modal tunes

).
However, altering chords, implieing different chords/tones, and just playing outside the changes and general is a great way to up your playing tools but be warned, creating dissonance is a fragile technique because it can easily be too harsh to the point where its just bad however, if you can pull it off then it really showcases you as a musician, people are often impressed, and hot girls love altered harmony haha (not really

)
I suggest the Jazz Theory Book by Mark Levine, it will explain all of this and a billion times more. It's a great read.