With just a couple of keyboard shortcuts, you can make your Position Indicator snap right to the transition you want, and in the exact position you need, exactly on the head frame (first frame) or on the tail frame (last frame).. Plus, the convenient thing is that Media Composer uses the same keyboard shortcuts for segments when you're moving them around.
Press and hold the cmd (on Mac) or Ctrl (on PC) keys.
To make the Position Indicator snap, drag it forward or backward in the sequence, or click the cursor near a transition, to make the Position Indicator snap to the Head Frame (first frame) of a segment.
To make a segment snap, do the following: Select a segment with either Segment Mode arrow (red or yellow). Now, when dragging segments, holding the cmd or Ctrl key makes the beginning (left-hand side, or head) of the segment...