Jill created a great watercolor course on UDEMY.COM

Jill spent the last four months creating a class on the foundations of mastering watercolor. As her usual self, she spent an enormous amount of time on attention to detail to ensure the message was clearly understood through the use of videos, animation and demonstrations.

The intent of the instruction is on the aspects of watercolor painting that is not commonly taught. Such as an in-depth understanding of what watercolor is from the technical/scientific aspects of water, pigments and binders, but doing it in a clearly understandable way with animations and demonstrations she's made.
Take a look at the curriculum to see the varied topics that would help students and also active artists in better understanding the tools they are using.

It is quite amazing how polished this class is. For anyone interested in looking at it, there are a number of free (previews) videos in the curriculum to get a feel of the instruction.

Click click here for a 60% discount for the class if you decide to take or preview it.