just one question, how much python do I need to know to be considered good? does that mean every popular feature + design patterns? vice versa in C++?

Thx for advice, after careful research I agree with you.

But but what about programming language :( no seriously I bought an o’reilly subscription, and I want to read books on a specific topic in programming while i m in train, bus , before bed, I can’t do maths all time! I searching more of a strategy which programming language will benefit me first, should I become advanced at one before I move to next or juggle both?