Hey I went through the course! I'm pretty familiar with editing already but I don't take pictures of people very often. I purchased the course hoping to learn about how you handle skin and was happy to went in depth on that! I found your breakdown of skin tones and focusing on them to be super helpful. Especially the part about trying to make the transitions between tones as smooth as possible.
Also, the part about RGB sensors + color curves was great! Technical limitations informing how to work with an image are key I think