How Python list really works - A straightforward overview of Python's list's underlying data structure.
Does Python have a stack/heap and how is memory managed? - A brief but perfect StackOverflow answer on how Python manages memory.
The Catalog of Design Patterns - Extensive list of Design Patterns with detailed description on what particular problem each solves and how to implement. Includes code examples on Python.
Understanding the GitHub flow - Easiest to start with. Sometimes good for projects of one or 2 people.
Trunk Based Development - Good for small teams and projects
Writing WebSocket servers - Implementation details of the web sockets.
The Python Graph Gallery - Collection of numerous charts made with Python. Includes code snippets, examples, and descriptions.
pep8.org - PEP 8, but a better representation
Empathy Online - A short article on the simple way to express emotions online
Code Review - A good guideline for code reviews
How to Write a Git Commit Message - Title speaks for itself