Q – Will I learn about how to prepare my designs for manufacture?

The most important things to consider when sending a file for manufacture are that it is a closed (watertight) STL file and that your minimum feature size is .25mm.  For example, lets say you want to create spheres/milgrain on a ring.  Don’t make them less than .25mm.  The same with text, not thinner than .25mm. The video tutorials will often mention manufacturing tolerances and limitations such as these.