1) Timeline - This includes the black bar that lists where you are in the video, in minutes and seconds, as well as the thumbnail pictures of the video.

2) Playhead - The vertical, thin, blue line that indicates what section of the video is currently showing.  The Playhead will move as video progresses, and you can also move the Playhead manually, to quickly get to an exact section.  You can also click on the top of the Timeline, to quickly jump to that location.

3) Zoom - The circular buttons with a "+" or "-" sign in them can be used to disclose more or less thumbnails.  The more thumbnails you can see, the easier it will be to select an exact part of the video.  The less thumbnails you can see, the easier it will be to view more of the Timeline at once.

4) Segment - Each video starts out with only one Segment.  If you split the video into multiple parts, then each fractional Segment can be treated independently.  You can resize, move and delete a Segment.  The end of a Segment has rounded corners.

5) Selection - Any part of the Timeline that is highlighted light blue is a Selection.   Click on a Segment of video to make it a Selection.

6) Tag Editor - This button looks like a lowercase "i", and it opens up a window where you can add or adjust the Tags for the current video.

7) Go To Beginning - This button will immediately move the playhead to the beginning of the video.

8) Fast Rewind - This button will play the video backwards, at fast speed.

9) Play - This button will play the video at normal speed.

10) Fast Forward - This button will play the video forwards, at fast speed.

11) Current Time - This display will show the current position in the video, in minutes and seconds.

12) Mute - This button will turn the playback of audio off, and on again.  It will not permanently remove any audio from the video.

13) Split Segment At Playhead - This button looks like a pair of scissors, and it will split a segment into two parts, starting at the current Playhead location.

14) Delete - This button looks like a trash can, and it will delete the currently selected Segment.  If you use the Delete button by accident, you have the option of using the Undo command to restore the missing Segment.  You can also use the Revert to Original command to change the video back to its original form.