Also, may I suggest that if you're going to offer tutorials about how to animate , you should understand how to animate (better).
You've got one called "Bouncing Ball Final Render" .
https://www.youtube.com/watch?v=j6Xx6lSfObo" onclick="window.open(this.href);return false;
The "rendering" on the ball is ok (although the drop shadow makes no sense because it's not contacting the ground plane) , but
nice surface rendering doesn't mean anything if the animation doesn't work . The arcs and spacing on the bouncing action of the ball are incorrect, especially near the end when the ball should be losing momentum and slowing down , it is way too "jumpy" and fast at that point . As it is rolling to the right the ball pops-off on the last frame , but should have continued to roll off screen (more slowly) as it is coming to a stop . The bouncing ball is an intro-level animation exercise. Master the spacing and timing of the bouncing ball before you offer to teach it to others.
Here's what I meant about the drop shadow and where it should contact the ground plane , based on the light source indicated by the rendering on the ball --

- Drop Shadow is not on ground plane.jpg (72.69 KiB) Viewed 22095 times

- Position of cast drop shadow copy.jpg (64.15 KiB) Viewed 22095 times
.