For windows:
Action Shortcut
Toggle play/pause the video K or Spacebar
Go back 5 seconds Left arrow
Go back 10 seconds J
Go forward 5 seconds Right arrow
Go forward 10 seconds L
Go to beginning of video Home
Go to end of video End
Restart video 0 (not the keypad number)
Skip to a particular section of the video Numbers 1-9 (not the keypad numbers)
(Eg: 5 goes to the video midpoint)
Go to Full Screen mode F
Exit Full Screen mode Escape
Increase volume 5% Up arrow
Decrease volume 5% Down arrow
Mute/unmute video M
Turn captions on/off C
Cycle through options B
for caption background color
Increase speed Shift + > (may not work in all browsers) or Shift + . (period)
Decrease speed Shift + < (may not work in all browsers) or Shift + , (comma)
Move forward 1 frame when video is paused . (period)
Move backward 1 frame when video is paused , (comma)
Move to the previous video in a playlist Shift + P
Move to the next video in a playlist Shift + N
For more information, see here.