i think its .com
it has so many things its not funny. best way to do things, is practice. fool around with the filters, eraser settings, colors. I guarantee just by playing around you will be better than just "Oh, click this, set it to this, and im done. Excellent tutorial."
Also, I have been thinking of starting doing a bit of it. Maybe il take a look on youtube.
What I used to do was type in whatever I wanted to do, and add the word photoshop or tutorial at the end.