Below is a list of free watercolor lessons:
Choosing Watercolor Brushes
Preparing to Paint
Creating a Color Wheel
Color and Value
Painting Clouds in Watercolor
MORE WATERCOLOR TIPS
Painting Trees in Watercolor and Pen and Ink by Claudia Nice (Video)
Loose Roses in Watercolor by Deb Watson (Video)
How to Make a Simple Watercolor Field Easel by Steve Mitchell (Video)
How to Paint an Eye by Tom Fleming (Video)
Watercolor Splatter Painting by Cody David (Video)
How to Use Salt with Watercolors by Tom Fleming (Video)
5 Beginner Watercolor Mistakes by Jennifer Branch (Video)
Uses for Masking Fluid by Rob Dudley (Video)
Watercolor Pencil Tutorial – Poppy by Dion Doir
Watercolor Pencils Tips and Techniques by Blick Art Supplies (Video)
Understanding Color by Quill.com