Summarize when speaking in public

Another good tip is summarize always when is possible. It is not necessary to be a book for speaking in public, you don't need to give all the details regarding the subject. It is obviously that you must have a good knowledge of the subject. You should know more than the auditorium, but does not need to search hours and hours for material which could become too much dense and annoying for the public. Try to make that information as simple as possible, to reach the biggest number of people. Obviously it does not apply for the formal and College presentations that you must supply exactly a dense and massive information.