1. What is the best and also fastest way to learn the language in 2020? (please recommend resources)
2. Do I need to learn Python 2.x or just latest version?
3. What Python API's/libraries/frameworks are most in demand when applying for work?
Thank you all in advance.
Edit: formatting
Depending on libraries, it highly depends on what you want to do. Python for data science? There are tons of great open books.
Python is great for its REPL shell. You can learn the language by experimenting and exploring. This approach is also part of many API docs in python, in contrast to many other comparable programming languages.