Learning how to improvise isn't something you can become good at by reading a book, or even reading this thread. Improvising entails a lot of different aspects of music, and theory. If you play chord tones the whole time you sound like too much of a classical player, if you play non-chord tones the whole time you sound inexperienced.
Truthfully, you have to discover what "works" and what doesn't by yourself. This can obviously be supplemented by transcribing solos and listening, but it all really comes down to you putting in the hours and figuring things out.
Truthfully, you have to discover what "works" and what doesn't by yourself. This can obviously be supplemented by transcribing solos and listening, but it all really comes down to you putting in the hours and figuring things out.