Summer Scheming!!!!!!
SICP textbook, free online:
https://mitpress.mit.edu/sites/default/files/sicp/index.html
The Scheme Programming Language, 4th Edition:
How to Design Program, 2nd Edition:
Other books:
The Little Schemer, 4th ed, Friedman and Felleisen
Simply Scheme, Brian Harvey and Matthew Wright
Scheme and the Art of Programming, George Springer and Dan Friedman
Racket:
Chez Scheme:
https://cisco.github.io/ChezScheme/
R5RS Scheme (older):
https://schemers.org/Documents/Standards/R5RS/
R6RS Scheme: