Artists who inspire me and I feel are excellent resource for information.
Author & Illustrator Shoo Rayner
Videos by Shoo:
Watercolour 101 - get started with Watercolour painting
How to use watercolours (or watercolors)
Artist Jane Blundell
Artist Liz Steel
Artist Angela Fehr
Naturalist John Muir Laws
My recommendations for supplies. Useful for everyone but tailored to the beginner watercolorist wondering where to get started.
I also highly recommend brushes from Rosemary & Co. Their series 402 designer pointed round brushes are comparable to the Silver Black Velvets. They make an incredible range of products for all mediums and their free catalog provides life-size images of their brushes so you can really get a feel for the product before ordering.
I will continue to add to this list over time as I collect resources I find valuable.