Man you ask a question too broad for an answer. Editing video is way more than cutting and placing video clips. It start with how you record the footage, the type of editing you like to use (fast pace, slow, dramatic, etc). What else can you do? Practice, practice and more practice. Is the only way to get better at video editing. I suggest to start with Videomaker editing webinar, it will really help you understand some tecniques. Another thing is when watching movies look at them from the eyes of the video editor, this means analyzing the cuts, camera angles, sequences order, music and audio effects position and so on.
