Learning how to use dtrace / bpftrace [0] is very valuable if you ever need to get into serious systems profiling.

There are some really cool data structures out there you might not know about. One of my favorite basic ones that I get a lot of use out of is the trie [1] (a.k.a. prefix tree). Very useful for IP calculations.

Also look into probabilistic data structures [2], very amazing things can be done with them.

[0] https://en.wikipedia.org/wiki/DTrace

[1] https://en.wikipedia.org/wiki/Trie

[2] https://en.wikipedia.org/wiki/Category:Probabilistic_data_st...