I like Code Kata approach, it allows to learn and practice.

But dislike siloed websites like Leetcode where they ask you to bear with their awful web experience, I want to keep my code and notes offline and close in case I need it in a year or 10 years.

Approach with simple test files and exercises is more appealing to me https://github.com/dabeaz-course/python-mastery

So what is the goal here, to be like Leetcode ? or spread knowledge ? If latter, put material as plain markdown and .py files on github repo, we will say thank you.