You have to watch the video to find the parts you want. The only difference between the timeline and the trimmer is that editing on the timeline is faster. You split in the middle of the unwanted section after creating markers, drag the two ends back to the markers, and drag the remaining video back to the end of the approved section. On top of that, if you ever change your mind about where the “cut” should be, all of the video is still available. If the “trimmer” trims it, you have only a second or two beyond the start and end point to recover a lost section.