After Effects On the Spot[c] Time-Saving Tips and Shortcuts from the Pros
To trim a layer in the timeline, drag the triangles on either end of the clip to a new point in time.
If you are at a frame when you want an edit to begin, press Option+[ (that's left bracket) (Alt+[ ) to trim the beginning of the layer or Option+] (that's right bracket ) (Alt+] ) to trim the end of the layer.
Once you have in and out points, you can slip your edit in the timeline using the Pan Behind Tool.
Tool.
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Select the layer
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Choose the Pan Behind Tool
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Mouse over the layer in the timeline and drag either left or right to slip the edit.
To trim numerically , expand the In and Out Columns and enter your desired In- and Out-points. Changing Duration will stretch the layer.
