Why do you want to? If you're wanting to make a game, then just pick one you want and scale it down. I was curious about Unity some time ago and did a Lynda.com

Why do you want to? If you're wanting to make a game, then just pick one you want and scale it down. I was curious about Unity some time ago and did a Lynda.com course (I had free access at the time through work) - it was pretty quick and easy and gave me a feel for unity. Edit: unity has free courses to https://learn.unity.com/courses https://learn.unity.com/courses