The top level page for this project includes a help section in which the first pointer is to a "hackpad" tutorial:

1. For a walk-through of a common basic processing pipeline, see our hackpad

However, the https://hackpad.com site seems to be defunct (and probably has been for many years?: https://techcrunch.com/2017/04/26/dropbox-is-closing-down-hackpad/). The Hackpad code is available (https://github.com/dropbox/hackpad) but hasn't been updated since around the end of the website.

If the content is available, perhaps it can be ported elsewhere? Otherwise, this link could at least be removed (seems especially confusing to have it as the first resource listed...).