Torbjørn Rasch Pettersen
Highly recommended.
Whatever type of photographer you are. Whatever type of photography you do.
Karl Taylor Education has some (most of the time a LOT of) tips, tricks and full on educational content. I initially came to get better as a product photographer, and IMHO, Karl Taylor is one of the most imaginative and flat out best out there. But there is so much great content, it would be stupid to just skim the top. Worth every penny, and then some.