How to become a expert in python

Answer 1

Well first I'd recommend to start with the SoloLearn's Python tutorial, after these are clear:
Variables
Basic datatypes:
Strings
Integers
Floats
Booleans
Iterables:
List
Tuples
Dictionaries
Sets
Functions
Conditional statements
Loops
Exception handling
File handling
OOP:
Classes
Objects
Modules

Then you might be ready for next step.

Answer 2

I would say practice

Answer 3

Thank you sir