Whatever you want to learn, you might also want to buy a paper book on the subject, e.g., one of the O'Reilly books. Interacting with paper is a qualitatively d

Whatever you want to learn, you might also want to buy a paper book on the subject, e.g., one of the O'Reilly books. Interacting with paper is a qualitatively different experience from interacting with a screen, and you may find (as I do) that it is effective to switch from one to the other as your mood and location varies.