External resources
The official darktable website does an amazing job already of listing additional resources about it, so I'm only putting a short overview here of resources that particularly stood out to me.
- Bruce Williams' YouTube channel
Has lots of very in-depth videos about different aspects of darktable; older ones will be based on outdated versions of the software, but new videos are still being released regularly. - Darktable speedrun: Stylish edits in 40 seconds
A forum post laying out a generic image editing workflow, focused on simplicity and speed.