The two books by Mark Levine are, indeed, incredible references, but if you’re just trying to wrap your head around the concepts, they’re a bit too advanced. I know–I started out with them and found them hard to understand at the time.
If you want to supplement the great lessons here on PianoGroove, I’d suggest taking a look at Kent Hewitt’s Jazz Piano: Methods and Songbook for Professional Playing. His explanations are quite clear, and he includes transcriptions of tunes to practice that are accessible. It’s a 2-volume set available in two versions:
PDF format ($50.00). He includes covers for each volume and instructions on how to print them off if, as you suggest, you want something “away from the computer and pads.”
Hard copy ($75.00 + $5.00 shipping).
He also has a ton of related videos on YouTube.
I use PDF format exclusively with a 12.9" Apple iPad Pro. The pages are the same size as printed lead sheets/transcriptions–and you can zoom in on difficult passages if, like me, your eyes aren’t what they used to be . And I like having all of my PianoGroove lessons, my books, lead sheets and transcriptions that I’ve found all in one place–and all at the weight of an iPad. The physical books and assorted papers I have weigh a ton and take up a couple of bookshelves. If you’re curious about what I use use to manage the PDF’s, let me know.
Here is the Table of Contents for the two volumes if you’re interested. Have fun.