Hi Steven,

What exactly are you asking about? Just about the particular act of cutting up and trimming a video file in particular or about using the program in general. If it's the latter, your question might be a little too broad and I would have to suggest starting with the documentation and tutorial videos and getting back to us if you have more specific questions. If it's just about trimming video clips, maybe the following instructions will help:

First you need to split up the video clip/object in question, isolating the part you want to remove. You definitely should operate in the timeline mode for this, as it's the only mode that allows for comfortable and accurate positioning and cutting. Now, place the cursor (= the play marker) at the beginning of the part you want to remove and make sure the object/track in question is selected. Press the "T" key on the keyboard to split up that object at the cursor position. Repeat this procedure for the end of the part you want to remove: Place the cursor and press "T". Now the original clip/object is separated into three individual objects. The one in the middle is the part that you want to remove. Select it with the mouse pointer and press the "Del(ete)" key on the keyboard to remove it. You can close the gap in between the left and righ object now by holding down your left mouse button on the right-hand object and dragging it to the left until it snaps onto the left-hand object. Done.

I hope this helps.