To make it easier to align clips when you are editing in Adobe Premiere Pro, you can use the "snap feature." When you move a clip that has the snap feature activated, it automatically aligns with, or snaps, to the edge of another clip. Snapping can help ensure you don't accidentally insert or overlay a clip onto another when dragging clips around within the Timeline.
To enable the snap feature, click the "Snap" button on the Timeline panel. It is located in the upper left-hand corner of the Timeline panel under the time indicator.
Drag the edge of the clip you are moving close to the edge of another clip you wish to align it with.
When you drag snapped clips, a vertical line with arrows will appear and indicate when clips are aligned.
To disable the snap feature, click the button again.
You can toggle back and forth between enabling and disable the snap feature using the keyboard shortcut "S." This will work even while in the middle of editing.