So I've also been busy taking the Sam Nielson Advanced Lighting Course (self taught,) at Schoolism.
Overall, I'm really pleased with the course. He covers a nice variety of topics with a great deal of information all in one course. I liked the thorough explanations about how light works along with the painting demonstration. I realized how important it is to know not just how to paint things on a superficial level, but to know how they work in real life.
After taking the self taught, I would recommend taking the course with the teacher feedback if you can afford it. It would have been amazing to get a more indepth critique about your work to see what exactly you personally need to improve or work on from the eyes of an experienced artist.
If not, I would still recommend taking the self-taught course. You can definitely take advantage of looking at all the previously critiqued videos. You could learn a lot from these!
Here is a sample of the work I did. It is not an easy course! (at least not for me). I have so much to learn and do! :)