very grateful that this course is free for all, and the youtube lectures are neat too

real world ocaml 2e is nice, but like a lot of oreilly books about $LANGUAGE lately it's a lot of thinly-veiled $COMPANY opinions on $LANGUAGE best practices, where $COMPANY is, in this case, jane street. this is great if your motivation for learning ocaml is applying for a job at jane street

if you think ocaml seems cool because wow jane street does epic hft in ocaml, then read real world ocaml 2e

if you think ocaml seems cool because wow they wrote coq/fstar/the early rust compiler in ocaml, then read cs3110