Presentation Tips for Adult Audiences (American Chemical Society): This website gives you tips on how to give a chemistry presentation, focusing especially on how to put your research in context for the audience and how to work with the audience. There are additional links that go into detail about specific subjects related to presenting chemical information.
Powerpoint: Presentation Tips (Bates College): This website gives excellent advice on how to organize and format a Powerpoint presentation. This includes tips on what to include in slides as well as tips on how to format the slides such as font, color, and embedding videos. A great resource if this is your first time putting together a presentation and a great refresher for those who have used Powerpoint before.
Ten Simple Rules for Making Good Oral Presentations (University of Virginia): This website gives useful rules to follow when giving oral presentations. These simple rules can make a big difference, turning your presentation from just okay to incredibly effective.