Why is it worth to prepare a good presentation?

Today, basically each and every presentation includes slides. Many of us feel awkward during the public presentations. A well prepared presentation makes us feel more comfortable and less stressed out. It is not so easy to prepare a professional presentation and it requires following the rules and use of a number of tricks.

What should we know prior to the presentation? How to prepare a presentation draft? How to prepare good slides?

What mistakes are most common. During our workshops you will learn these rules and be able to finally prepare a good PowerPoint presentation.