Sometimes I end up teaching stuff, mostly about Elixir and related topics. Here's a more-or-less-complete list of materials, but head over to the blog as well for more.
Interactive Guide to Asynchronous Data Processing in Elixir
I wrote an interactive guide on asynchronous data processing in Elixir, in the form of a series of Livebooks that you can read and experiment with.
The material is on GitHub.
Protohackers in Elixir
This is a screencast series where I solve some network programming puzzles in Elixir. The challenges are provided by Protohackers, a website I recently found on the interwebs (it's sort of like Advent of Code, but for network challenges). You can find all the videos in this post.
Here's the playlist on YouTube: