Go to beginning or end of work area
Shift+Home or Shift+End
Go to previous or next visible item in time ruler (keyframe, layer marker, work area beginning or end)
J or K
note: Also goes to beginning, end, or base frame of Roto Brush span if viewing Roto Brush in Layer panel.
Go to beginning of composition, layer, or footage item
Home or Ctrl+Alt+Left Arrow
Go to end of composition, layer, or footage item
End or Ctrl+Alt+Right Arrow
Go forward 1 frame
Page Down or Ctrl+Right Arrow
Go forward 10 frames
Shift+Page Down or Ctrl+Shift+Right Arrow
Go backward 1 frame
Page Up or Ctrl+Left Arrow
Go backward 10 frames
Shift+Page Up or Ctrl+Shift+Left Arrow