Tinkercad Codeblocks

• When I change the name of a Variable, all the Variable names in other blocks change as well.
• When I input a number into the Shape blocks sometimes they don't update when I play the script. What is happening?
• I can't open some of my 3D Designs
• How do I learn more about using Codeblocks? Are there any lessons?
• How do I get my Codeblocks design to the 3D workspace?
• How do I share a link for a Codeblocks design?
• How do I copy the blocks for a Codeblocks design?