Some bookmarks:
https://jarednielsen.com/big-o-log-linear-time-complexity/
https://dev.to/lofiandcode/big-o-part-4-n-log-n-4hgp
https://www.cuemath.com/data/combinations/
https://dev.to/christinamcmahon/common-sorting-algorithms-in-javascript-58a7
Heap
Binary Trees:
- https://www.digitalocean.com/community/tutorials/breadth-first-search-depth-first-search-bfs-dfs
- https://www.enjoyalgorithms.com/blog/validate-binary-search-tree
- https://www.digitalocean.com/community/tutorials/balanced-binary-tree-check
- https://visualgo.net/en/bst
- https://www.baeldung.com/cs/heap-vs-binary-search-tree