Original author here. Thanks for the post! Would stick around to answer questions but I'm on vacation in Japan right now!

We're doing a poor job with navigation on the site ATM, so here are some "you might also like" hits for you:

A piece where we derive most of the main data structures step by step, starting with naked bits in RAM: - https://www.interviewcake.com/data-structures-and-algorithms...

A reference / cheat sheet for the main data structures: - https://www.interviewcake.com/data-structures-reference

A reference / cheat sheet for sorting algorithms: - https://www.interviewcake.com/sorting-algorithm-cheat-sheet