Almost every video problem is a duration problem. The interesting part is four seconds long and the rest is the host clearing their throat, or the good conversation starts right after a minute of setup. Cutting those parts out is the single most useful edit you can make, and it is the one people put off longest.
Two numbers, one result
Trimming here means giving the tool a start in seconds and an end in seconds. Everything outside that window is discarded, and everything inside is kept as a new clip. There is no timeline to drag around and no frame-by-frame precision, which is a deliberate simplification. For most edits, cutting on whole seconds is exactly right, and the result is a file that is immediately easier to share.
The audio is rebuilt in step with the picture, so a clip that starts at 34 seconds begins with the sound that belongs to it rather than a half-syllable carried over from earlier.
Cutting out the middle
Since the tool works from the outside in, removing a section from the centre takes two passes. Trim once to keep only what comes before the bit you want gone, then trim the result again to drop everything after it. Two trims, one clean file. It is slightly more work than dragging a selection, and considerably more predictable.
Where to place the cut
The most common mistake is starting a clip too early, on the breath before the first real word. Cutting on the silence frame rather than the speech frame makes a clip feel noticeably tighter. For the end, resist the urge to cut on the very last sound; trimming a fraction earlier gives the ending room to land and stops the clip feeling clipped off mid-word.
Where to go next
A trimmed clip is usually the right input for whatever comes after. If it is still too heavy to send, compressing it will finish the job. If it needs a wider frame for a particular platform, resizing now saves redoing the cut. And if the audio is worth keeping separately, it can be pulled out as its own file.
Why whole seconds are usually enough
The obvious limitation of a seconds-based trim is that you cannot land on an exact frame, so an edit that has to begin between two frames is not something this tool can do. That sounds like a problem until you consider how often it actually matters. For nearly every use, a cut placed on a whole second reads as clean, because a tenth of a second of offset sits below the threshold most viewers notice. It becomes relevant in two situations. Cutting mid-word, where any error is plainly audible, and syncing two clips against each other, where a drift of several frames accumulates visibly. For the first, start slightly before the word rather than on it. For the second, you need a proper editor with frame-level control.
Keep the original file rather than deleting it once you have the trimmed version. Trimming discards data permanently, and if the cut lands in the wrong place you will want the longer source to go again rather than the shortened one.