There are no secrets to discover as the steps to becoming a jazz musician have already been mapped out by previous generations of musicians and educators. My first suggestion? Don't waste your time online looking for "the secret."
Here are my top five non-secrets to learning to play jazz.
Project suggestion. Investigate the jazz curriculum outlines of jazz colleges and compare. Here is a start.
Jazz in America Lesson Plans through the National Jazz Curriculum - Hancock Institute of Jazz
TRADITIONAL JAZZ CURRICULUM - Jazz Education Network (jazzednet.org)
Yearly Program Study Plan; B.Mus. Jazz | Music - McGill University
Bachelor of Music in Jazz Studies - Education - Capilano University
Jazz Studies (BJazz) | Explore UM | University of Manitoba (umanitoba.ca)
You will note the following areas are common: lessons, theory, ear training, ensemble playing, history, and improvisation.
If I can help you call me, I teach piano, and jazz.
You've got to learn your instrument. Then, you practice, practice, practice. And then, when you finally get up there on the bandstand, forget all that and just wail.
I'm a professional pianist and music educator in West Toronto Ontario. I'm also a devoted percussionist and drum teacher.