Tutorials

Original Content

 * Responsive and Adaptive Web Design
 * Choosing and Using Type
 * Color theory
 * Logo design & conception

Grids

 * http://www.thegridsystem.org
 * 30 fundamentals on /gd/ by Canva.com

Typography

 * A whole wheen of ebooks about 'font basics' — I've not gone through all of these yet, but it actually looks pretty good. Thanks, Anonymous. Thankonymous.

Photoshop

 * http://www.photoshoptutorials.ws/
 * http://design.tutsplus.com/categories/adobe-photoshop