The manuals were great. I taught myself C/C++ in the early 90s mostly from the big stack of Borland books that came with Turbo C++. It’s hard to imagine learning something like that these days by simply sitting down and reading reference manuals.
Me as well, as a teenager those manuals were invaluable, it wasn't as if we could easily learn elsewhere.
It was either the manuals, or getting lucky with magazine articles or local library book selection.
Towards that end, I've been trying to put together a list of Literate Programming texts:
https://www.goodreads.com/review/list/21394355-william-adams...
I really wish that there were more, in particular, I'd dearly love to see a graphical QT (or other up-to-date) GUI app as a Literate Program.