Could you suggest me some books, sites, webradios, etc about jazz?
You might sample an artist or two from each genre to narrow your interest. I daresay most fans of a given genre are not fans of all. For that matter, the boundary between jazz and blues or rock or even classical are porous (Bob James' version of Bizet's Farandole "L'Arlesienne Suite No. 2[0] immediately came to mind).
My interest was sparked by two initial inspirations: my late brother-in-law (a musician himself) and a local FM radio station which played a broad spectrum of music (ironically, their license was eventually used for KFOG's South Bay version).
One delimiting criterion is pure instrumentals vs. vocals; another is which instruments you favor (guitar vs. brass vs. keyboard emphasis).
They do in fact have a course "Elements of Jazz: From Cakewalks to Fusion", and it's only 8 x 37 minutes. I haven't listened to it, but from my experience with their courses, I'd recommend it (though don't buy it at the full price on their website, wait for a sale or check amazon/audible/...)
[1] http://www.thegreatcourses.com/courses/how-to-listen-to-and-...
[2] http://www.thegreatcourses.com/courses/elements-of-jazz-from...
http://glassmaker.tumblr.com/post/137759512208/how-to-listen...
https://en.wikipedia.org/wiki/Jazz_(TV_series)
(seems to be available on youtube)
He plays a kind of live improvisational electronic music.