No one really uses the whole span of any standard library but theres going to be the top 20% of libraries you use all the time, what are they and what do you need to know here.

dataclasses

functools

itertools

string

enum

collections

unittest

trace and traceback

pdb

Appendix

Things not immediately touching
- concurreny stuff
- network stuff

https://docs.python.org/3.9/library/index.html https://pymotw.com/3/index.html