@schultzeworks has some great tutorials 
Dave you requested a while back ideas for new new tutorials, I suggested one on curves, and creating surfaces from them. I use Rhino most days on a professional level, mostly furniture and interiors, 3d perspectives and layouts, so very little in the way of curves/surfaces for more industrial/product design applications. Its something my thirst for knowledge and improving overall skills wants to learn There is a thread over on the Mac side, a door handle, I’d love to see the workflow and commands to create this in a video, you can see the thread here