To this day I remember the "crack" noise of flipping open the spiral-bound Applesoft BASIC manual (https://archive.org/details/apple-ii-basic-programming) and even the smell (slightly musty, slightly plasticky, slightly waxy- not like any book I've held before or since).

I liked it so much, I bought an Apple IIe and a copy of the manual on Ebay. It helped this old programmer remember learning to program.