[ksaj]

A lot of resources are free, but I still find plenty of value in the printed word.

For example, I bought Practical Common Lisp despite it also being available electronically for free, because I tend to write a lot of margin notes and highlight things that I know I'll want to see again. It is so much quicker for me to pick that book up and get to the info I want than it is for me to scroll through a PDF for the same info (besides lacking my personal notes). I have multiple random electronic copies I don't bother looking at, and one printed one that I refer back to quite often.

If you want to take some courses in complexity, check out complexityexplorer.org. They are run by the Santa Fe institute, so you know they're top of the line. You can generally take the courses for free since they are offered through grants, but of course you can donate and/or buy some schwag to support more of their (incredible) course and tutorial offerings. I just finished a course with them today, actually, and am working on completing a third from them.

[enaqxx]

Thank you, very valuable answer.