Python
Lessons filed under Python.
Python Working with text in Python Slicing, split, join, f-strings and a loop over lines, each a complete program rather than a one-liner.
Python Hashing and encoding in Python Six complete programs: bytes, hex, sha256, base64, base64url, and a small tool that uses all of it.
Python Addresses in Python Six complete programs, including the /31 that most calculators get wrong and the one call that will exhaust your memory.
Python Secrets and tokens in Python Five complete programs, including the one call that looks right and quietly gives you half the token you wanted.
Python Run your first Python Not one-liners. Whole programs, six to ten lines, put together a piece at a time.