This video gives some great examples
eg
Fwd or Rew 5 sec or 10 sec
Pause then Fwd or Rew 1 frame at a time - great for screenshots
and more.
Ignore the cheesy Miss Scotland Video
EDIT: Video creator has told me that the pressing ? while watching video will bring up a pop up with most of the shortcuts (though not the 5 sec Fwd & Rew, I think. - attached