It's called animation practice for a reason.
You will make mistakes but that's ok. Make your mistakes now and then get it perfect first time on your own projects ;)
Animate the default cube's location, rotation and scale.
The main idea of this exercise is to practice all the ways of setting keys, using keying sets and learn to overcome a few of the mistakes that you are bound to make when you first start animating.
Try to make it seamlessly loop and don't forget to have fun!
If you need help rending out the video, jump ahead to the last video of this chapter.