@yukinoh1989
For the ball / animation exercises you do viewport rendering actually, and it’s super fast. You have to render previews very often so it wouldn’t be very efficient to do slow renders each time… You don’t get any materials and lighting like you get with Cycles or Eevee though, you get just exactly what you see in your viewport in solid mode. Because it’s so fast, I usually just render it straight out as a movie file for convenience. Helpful CG Cookie video:
https://cgcookie.com/lesson/opengl-rendering
If you want to learn a bit more about the VSE, here are some CG Cookie videos that explain some of the functions:
https://cgcookie.com/lesson/filming-yourself
https://cgcookie.com/course/finishing-rendering-a-blender-animation (everything in chapter 6)
https://cgcookie.com/tutorial/how-to-loop-an-animation-clip-with-the-blender-vse
And this video might also be useful to you:
https://cgcookie.com/lesson/exporting-a-turntable
That’s all I know about this topic… hope this helps!