Horizontal is time, vertical is layers
The horizontal axis of the timeline represents time. Vertically stacked tracks organize the video, images, text and sound that appear together. Visual elements on upper tracks can cover the scenes below.
A clip’s length is not the source
A timeline clip represents the portion of a source used in the project. Shortening its end changes how long it appears. Zoom in to check that neighboring clips connect without unwanted gaps.
Work from the playhead
The playhead is the vertical line marking the time you are viewing. Use it as your reference when splitting a clip or choosing where a caption begins.
Move between the whole and the detail
Review the full duration to check the structure, then zoom in to refine timing. Playing the surrounding scenes together makes the pacing easier to judge than repeatedly watching a single section.

