The tutorial video, which explains Clips, Scenes and Sequencers is online:
https://www.youtube.com/watch?v=47exKwGwHko
By filming it, I noticed some bugs, which are already fixed in 3.01:
http://www.mossgrabers.de/Software/Reaper/Reaper.html
- Fixed: Tracks without a name did not show up.
- Fixed: New clip did sometimes not work.
- Fixed: Notes in Sequencer were not updated when clip was deselected and selected again.
Enjoy!