To use shortcuts click in the video window so your "focus" is on the video player portion of the window. 

ActionWindowsMac
PLAYBACK
Play videoSpace or KSpace or K
Jump to current Live point of the video streamShift+SpaceShift+Space
Mute the video playerTT
Display Closed Captions in the video playerCC
NAVIGATION & SCRUBBING
Move/scrub forward frame by frame or L or L
Move/scrub backward frame by frame or J or J
Scrub video forwardShift+L or Shift+Shift+L or Shift+
Scrub video backwardShift+J or Shift+Shift+J or Shift+
Jump forward 5 minCtrl+Alt+L or Ctrl+Alt+⌘ Cmd+⌥ Option+L or ⌘ Cmd+⌥ Option+
Jump backward 5 minCtrl+Alt+J or Ctrl+Alt+⌘ Cmd+⌥ Option+J or ⌘ Cmd+⌥ Option+
IN & OUT POINTS
Set current point as In PointII
Set current point as Out PointOO
Go to In PointShift+IShift+I
Go to Out PointShift+OShift+O
Replay clip from the In PointRR
Set In Point by Time entryAlt+I⌥ Option+I
Set Out Point by Time entryAlt+O⌥ Option+O
FINE-TUNING IN & OUT POINTS
Set In Point ½ second laterCtrl+L or Ctrl+⌘ Cmd+L or ⌘ Cmd+
Set In Point ½ second earlierCtrl+J or Ctrl+⌘ Cmd+J or ⌘ Cmd+
Set Out Point ½ second laterCtrl+Shift+L or Ctrl+Shift+⌘ Cmd+Shift+L or ⌘ Cmd+Shift+
Set Out Point ½ second earlierCtrl+Shift+J or Ctrl+Shift+⌘ Cmd+Shift+J or ⌘ Cmd+Shift+