Shotcut power user, James Woo, has created a wonderful course on how to use Shotcut.
Currently, it contains 24 videos and costs $25, but it only costs $20 using the coupon code in the link on this blog post! As the lead developer of Shotcut, I reviewed the entire course, and I think it is very good. James clearly and accurately explains many thing from basics to more advanced techniques such as picture-in-picture, chroma keying, and using custom HTML. The lessons are sequenced in a nice progressive manner, but you can also directly visit specific topics. These are presented in the English language.