These write-ups look really useful. There are many out there but they either tend to be too verbose, or cover too small an area. You cover a bit more end-to-end but in a concise and complete way.

Also, it's great to pick off-the-beaten-path topics: the Phoenix command-line one is one I recently actually had to sort out from bits I found here and there.

Other topics I'd be interested in (if you need some suggestions):

  - more advanced Ecto usage such has ways to work around some limitations (e.g. fragment() or execute(SQL) for migrations)
  - the whole GenServer thing. How these Erlang/Elixir tasks run in a logical machine seamlessly over the network with high uptimes.