How can I effectively incorporate major 9th chords into my piano playing?

To effectively incorporate major 9th chords into your piano playing, practice playing the root, major 3rd, 5th, major 7th, and 9th notes of the chord together. Experiment with different voicings and inversions to create a rich and harmonically pleasing sound. Practice transitioning smoothly between chords and integrating them into your repertoire to become more comfortable with their use.