In this picture, I am playing a part of a clip that I filmed, and choosing which parts of it I want to put in the actual video by putting brackets around the specific part and dragging it down.

This is a screenshot of me playing through the bit of the video that we are keeping to make sure that is sounds right all together.

This screenshot shows me using the razor tool. When I found a part in the video that I did not like, I clicked on the razor tool to just erase that little bit from the video to make it look better.