Design: Illustrator, Photoshop, Corel Draw
http://www.vectips.com
http://www.tutsplus.com
http://www.zetaprints.com/help/free-coreldraw-tutorials/
http://www.photoshopstar.com/
Web design:
http://www.w3schools.com/
Linux:
Computers:
http://www.techtutorials.net/
Please use copy and paste for the links. I don’t use direct links for SEO reasons. I am not affiliated with any of the websites presented here.