Just started using this platform and decided I may as well share this and see what people think: https://github.com/TuanaCelik/BrilliantCiphers

This is an interactive Jupyter notebook that explains the relation between ciphers and the frequency of letters in an encrypted English text. You can launch the interactive notebook with binder (at bottom of Readme), and play around with the graphs and code. It takes a while to load the first time..

The idea was to design a course on ciphers for people with basic Python knowledge. Let me know what you think!