To edit out a section of video, move the playhead to the point at the beginning of what you want to remove, (the inpoint), then use the cursor to grab the edge of the sequence thumbnail, which shows up as a red bracket, then drag this to the playhead. Scroll playhead to an outpoint by watching Program monitor above as you scroll. then capture the edge of the clip with the cursor and drag it to the playhead. the two ends of the clip are lopped off. To close the gap either click and drag or click in the blank space and press the delete key on the keyboard, know as a ripple delete. Be sure to have the Snap function turned on.
You can change the sequence of clips in the Timeline. Start by locking the audio track if you have one in your Timeline. You can do this by clicking the padlock icon at the left of the track. Select the clip you want to move,then jold down the command key on Mac, control key in Windows, and drag the clip to the point in the Timeline you want it to appear, then release the mouse.