Just like working in a word processor, you can copy and paste frames or entire clips. I use copy and paste when I want to create a new clip out of a selection of frames without breaking up the original clip, in case I want to use the footage somewhere else while I'm editing.
If no clip is selected before pasting, the new clip appears at the Playhead location, even if that's in the middle of another clip. Before pasting
After pasting
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