One of the best ways to improve your presentation is to edit the amount of copy on each slide. I'm not going to tell you how many bullets to put on a slide or how many words to include in each bullet point. The general rule is that you should edit your copy down to the minimum number of words necessary to get your point across and fill in the rest while you are speaking. If a slide has too many bullets, break it into two slides. Minimize the number of element in your charts. Less text means greater legibility and a cleaner-looking presentation.