From them you will learn how to create grass, hair, rain, an explosion, and other effects that use the physics engine. Also, you will get acquainted with the methods and techniques for creating animation of objects, working with animation curves and methods that allow you to save your time and effort, and at the same time give a better result. ')
Ps In Blender 2.6, there were BIG changes, and it should be said TO THE BEST. Now it is even more convenient and faster to work!