Youtube shortcuts

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
Skip to a particular section of the video (e.g., 5 goes to the video midpoint)	Numbers 1-9 (not the keypad numbers)
Restart video	0 (not the keypad number)
Go to Full Screen mode	f
Exit Full Screen mode	Escape
Go to beginning of video	Home
Go to end of video	End
Increase volume 5%	Up arrow
Decrease volume 5%	Down arrow
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)
Mute/unmute video	m
Turn captions on/off	c
Cycle through options for caption background color	b
Move to the previous video in a playlist	Shift+p
Move to the next video in a playlist	Shift+n