In python which modules should I learn for becoming a master in python please help me iam confused to learn which modules

Question

Python modules

Answer 1

Master of what?

Answer 2

there are a lot of modules
But the interesting of them are:
itertools, collections, datetime, calendar, math, sys, and os

P.S.
All mentioned is just my Humble opinion, and it is not pretending to be true for everybody.
no animals has been injured when the text above was typed.
All the module names was changed,
any similarity with real life is just coincidence.
Based on True Story.