You can use contextual menu options or keyboard shortcuts to cut, copy, and paste selected keyframes.
To quickly copy-paste a keyframe or keyframe region:
The keyframe selection is copied and pasted at the new location.
To copy a keyframe or keyframe region:
The keyframe selection is copied and stored in memory so that you can paste it in a different location.
To cut a keyframe or keyframe region:
The keyframe selection is removed and stored in memory so that you can paste it in a different location.
To paste a keyframe or keyframe region:
A copied or cut keyframe selection is inserted where you right-clicked.
Pasting a keyframe on a keyframe region deletes all keyframes within the region and replaces the first key of the region with the pasted keyframe. When you paste a keyframe region on a keyframe, the region’s first key replaces the original keyframe.
If nothing is selected on the timeline when you paste, the pasted keyframe selection is placed at the current time.