Camera shake gives a locked-off shot a handheld feel, or adds impact to a hit. Premiere Pro has no built-in shake button; you build the effect by giving position and rotation small, irregular keyframes.
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To use the same shake on several clips, put the effect on an Adjustment Layer and stretch that layer over the clips.
The Shake tool in Sylba's Studio section gives a clip a handheld feel: it builds the vibration in position and rotation by itself, and you choose the intensity. The result stays on the timeline as keyframes, so you can fix any part afterwards.
For a short jolt on a single hit, three or four hand-set keyframes are enough. A handheld feel across a whole clip takes dozens of keyframes; a ready-made tool saves time there.
Keep the intensity low; viewers should feel the shake, not notice it. Long shake on a talking face is tiring. In a music edit, land the strongest moment of the shake on the beat.
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