Growing up with limited capabilities (e.g. sh or ksh on headless SunOS/Solaris and AIX servers) and a lot of room for failure is what did it for me. I learned to think before typing, break things and fix them again. I still learn that way and I find that life without crutches and with lots of tinkering improves my understanding of how most things work and makes me more efficient in the long run.

Also man pages.

It’s timeless