Synchronize: for clips already on a timeline
Clip › Synchronize moves the selected clips on a sequence so they line up. The Synchronize Point can be the clip start, the clip end, timecode, a clip marker or Audio. It is the quickest way to fix one shot, but the result lives only in that sequence.
Merge Clips: one reusable clip per take
Select a video clip and its recording in the Project panel and choose Clip › Merge Clips. Premiere makes a new merged clip that you can use in any sequence, leaving the source files untouched. Older versions could merge only by In point, Out point or timecode; recent ones also offer audio. It is the tidy choice when you have dozens of interview takes, each with its own recording.
Create Multi-Camera Source Sequence: for several angles
Select every angle and the recorder in the Project panel, choose Clip › Create Multi-Camera Source Sequence, and set the Synchronize Point to Audio. Premiere builds a multicam source you can cut live between angles in a sequence. It is also the standard way to sync two or three cameras even if you never use the multicam switching.