You can perform several timing tasks in the ruler above the Timeline track area:
Drag the playhead to a specific frame to view the project at a specific time.
Drag the In and Out points of your project so playback occurs only within the specified frames. See Define the play range.
Select a range of frames, so you can delete, cut, or paste into them. See Make changes to a region (range of frames).
Add or edit project markers, which can be added to your project to identify an important frame or range of frames. See Work with markers overview.