This is an awesome rundown of the whole stack. It's almost like you've explained this stuff before. ;)

It might sound complicated, but for typical applications almost all of this happens "under the hood". Usually you'll just add an attribute to `main` to start your runtime, then you can compose/await futures without ever needing to think about `poll` and friends.

Here's a small example: https://tokio.rs/tokio/tutorial/hello-tokio.