Note: You are currently viewing documentation for Moodle 2.3. Up-to-date documentation for the latest stable version is available here: Teaching Don'ts.
Don't encourage users to run Power Point presentations in their browsers
Users, of course, want to simply click on a PPT presentation and run it inside their browsers. This usually works out pretty well, but not always. You will have far fewer complaints and problems if your users download PPT presentations to their desktops and run them from there. Encourage them to do so. By the way, this is not a Moodle problem; it is a browser problem.
Do not upload large Power Point presentations if your Moodle disk space is limited. Convert your PPTs to .swf files using Open Office. The only disadvantage is that you will lose all animation.
As an alternative to using Power Point at all, you might want to consider the presentation module or the lesson module.
Don't be afraid to experiment
Moodle is designed to be played with - you can't break anything!