Selecting Edits and Clips to Trim
Regardless of where you actually trim your clips, you almost always select the edit
points in the Timeline. Selecting an edit point is a lot like selecting an entire clip, except
that you are only selecting a clip’s In point or Out point, or the Out point and In point
of two adjacent clips. If linked selection is turned on, any edit points or clips that are
linked to the one you select are selected as well.