Daniel Lemire has some very interesting blog articles about "low level" data structures that you'd think you understood in first year CS. I just linked to a go

Daniel Lemire has some very interesting blog articles about "low level" data structures that you'd think you understood in first year CS. I just linked to a google search on "hash tables" because that's what you asked for, but some of his other posts are really quite fascinating. https://www.google.com/search?q=site%3Alemire.me+hash+table https://www.google.com/search?q=site%3Alemire.me+hash+table