I think you mean from the 2nd module… The rhythmic cells, like the “charleston”, “ragtime”, are just syncopated components of melodic lines you will continuously come across in written music. They appear frequently in the etudes and rhythm templates. This is where you’ll be practicing them.
Other than knowing what they should sound like at a glance, you can use them when creating your own lines. That should lead to being able to identify them, say in other players solos for the purpose of transcribing.