I'm learning lots of Amazon Web Services topics via videos on YouTube. There's a lot of material, but I can absorb the content faster than people speak. Also, I often want to go back and listen to what they say a few times.
I use these YouTube keyboard shortcuts ALL the time:
space -- play/pause
f/esc -- enter/leave full screen mode
left/right arrows -- go back/forwards five seconds
</> -- slower/faster
We also have these keys:
up/down arrows -- increase/decrease volume
0-9 -- jump to spot in video, 0=beginning
It's really freeing to learn material 150% or 200% faster using these keyboard shortcuts. Enjoy!
(Thanks to University of Michigan)