Your informative speech should rely on communal wisdom. For example, I might talk about racing in sailboats. I would talk about the various rules, what types of boats are involved, and what the parts of the boats are called.
I might look to professional and club organizations to find pictures to support my presentation.
When writing a persuasive speech, it is important to understand both sides of an issue. The databases listed below help provide a more complete picture so you can effectively present your points and refute the other side.