iMovie is the NLE (non-linear digital editing computer program) that we use in Motion Graphics 1. Below is a full tutorial that covers most aspects of this super powerful program. If you stick with Motion Graphics, you will use Final Cut Pro X in the second semester.
Here is the tutorial starting at 6:18 which is the meat of what we didn’t cover in the slideshow and bouncing ball projects during animation since we were using stills. Watch to about 12:06 or so before you start editing your first movie.