You must be really ready to fight. Preparation is very important in presentation. Interesting presentation for 30 minutes which made Steve Jobs was prepared for sevral days even several weeks. Prepare presentation materials it takes a long time especially with the use of slides, we expected to be able to design and integrate the content of the slide by slide presentation. To that end, practice until you actually prepare your presentation materials carefully. This public speaking tips is the most important you should do.
Communicate with the audience. The first public speaking tips, as a presenter we must be able to know our audience before making a presentation, such as greeting the audience, providing an interesting and unique opening and ask some questions conformed to the topic of the presentation that we will bring.