Tutorials for Flarum, a forum software:
- Shared Hosting Installation
- Formatting Guide (for users)
- Adding to <head>
- Help pop-up/overlay quick reference guide
- BBCode extension template
There are of course many more (and more technical) tutorials at Flarum's official discussion forum.
One of the core developers/contributors, Clark Winkelmann, hosts live coding tutorials and shares the recordings here.
SitePoint has published a few tutorials as well.