Tutorials:

Tutorials are a great tool to use when learning about photoshop and paintshop. I myself have used them time and time again. It's the main way that I taught myself.

Photoshop: http://www.pixel2life.com/tutorials/Adobe_Photoshop/All/
PaintShop Pro: http://www.pixel2life.com/tutorials/Paint_Shop_Pro/All/

Pixel2life.com is the best online resourse that I know for tutorials, and ideas. All buding artists should bookmark those links.