Photoshop is a powerful tool, and it's useful for anyone who can take a picture.
EasyGuides for Photoshop provides step-by-step directions for many different features ranging from basic to advanced. Want to learn how to create layers and text? About all those tools in the sidebar? How to remove red eye? Implementing filters and photo enhancements?
The guides are designed specifically for tablets unlike many training programs that already existed and were ported over.
Note on versions: These guides cover core Photoshop activities, so these guides are relevant no matter which version of Photoshop is being used.