Out of curiosity, is there any thorough Qt for mobile tutorial working nicely on Jolla C? I am even willing to pay for it if it teaches me how to do advanced st

Out of curiosity, is there any thorough Qt for mobile tutorial working nicely on Jolla C? I am even willing to pay for it if it teaches me how to do advanced stuff, like getting straight to OpenGL with the least amount of clutter etc. I would love to write some Sailfish-only apps cool enough to attract regular people.