Ask HN: What concepts one has to be aware to be claimed as core python developer

I have been using python for almost 4 years. But I still feel I am naive in python. How can I improve my understanding of python and how it works internally. Some of the concepts I am referring are:

1)How actually "sets" works to store only unique things?

2)What is the role of hashing in python?

3)Why people are saying python is slow?

4)what makes the numpy arrays faster than core python arrays?

5)What is the purpose of adding "compile()" function in the python core?

6)What is the exact problem with python threads?

These are some of the questions I ignored but just used it. Instead I want to know/get answers for the questions like these? How to think in this way to not just use but understand how it really works?