iMovie is a movie editing application that is part of the iLife suite of digital lifestyle applications that allows users to create movies from a number of different sources including digital video cameras, DV-encoded files, and pictures.
Apple - Has tutorials for beginners that show the steps in the iMovie making process. Also, the website offers troubleshooting in case something does not work correctly.
MacCreate - Offers tutorials for the basics of iMovie.
Selected Lynda Tutorials:
iMovie '11 Essential Training: The course covers the entire post-production process, from importing audio, video, and still images to adding effects, creating trailers, and sharing your finished projects on social networks.