Adobe After Effects - Manual (Page 53)

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Note:
Some shortcuts are marked with an asterisk (*) to remind you to make sure that Num Lock is on when you use the numeric keypad.
Showing properties and groups in the Timeline panel (keyboard shortcuts)
This table contains double-letter shortcuts (for example, LL). To use these shortcuts, press the letters in quick succession.
Split selected layers (If no layers are
selected, split all layers.) Ctrl+Shift+D Command+Shift+D
Precompose selected layers Ctrl+Shift+C Command+Shift+C
Open Effect Controls panel for
selected layers Ctrl+Shift+T Command+Shift+T
Open layer in Layer panel (opens
source composition for precomposition
layer in Composition panel) Double-click a layer Double-click a layer
Open source of a layer in Footage
panel (opens precomposition layer in
Layer panel) Alt-double-click a layer Option-double-click a layer
Reverse selected layers in time Ctrl+Alt+R Command+Option+R
Enable time remapping for selected
layers Ctrl+Alt+T Command+Option+T
Move In point or Out point of selected
layers to current time [ (left bracket) or ] (right bracket) [ (left bracket) or ] (right bracket)
Trim In point or Out point of selected
layers to current time Alt+[ (left bracket) or Alt+] (right
bracket) Option+[ (left bracket) or Option+]
(right bracket)
Add or remove expression for a
property Alt-click stopwatch Option-click stopwatch
Add an effect (or multiple selected
effects) to selected layers Double-click effect selection in Effects
& Presets panel Double-click effect selection in Effects
& Presets panel
Set In point or Out point by time-
stretching Ctrl+Shift+, (comma) or Ctrl+Alt+,
(comma) Command+Shift+, (comma) or
Command+Option+, (comma)
Move In point of selected layers to
beginning of composition Alt+Home Option+Home
Move Out point of selected layers to
end of composition Alt+End Option+End
Lock selected layers Ctrl+L Command+L
Unlock all layers Ctrl+Shift+L Command+Shift+L
Set Quality to Best, Draft, or
Wireframe for selected layers Ctrl+U, Ctrl+Shift+U, or
Ctrl+Alt+Shift+U Command+U, Command+Shift+U,
Command+Option+Shift+U
Cycle forward or backward through
blending modes for selected layers Shift+ - (hyphen) or Shift+= (equal
sign) on the main keyboard Shift+ - (hyphen) or Shift+= (equal
sign) on the main keyboard
Find in Timeline panel Ctrl+F Command+F
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