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https://www.codecademy.com
http://www.lynda.com
https://www.udacity.com/
https://www.coursera.org/
The Best website i can recommand to improve our computer skills, is :
https://openclassrooms.com
Try these websites:
https://alison.com
http://m.lynda.com
http://meganga.com
Codeacademy.com
coursera.com
edx.com
www.forbes.com
The simplest way is in You Tube.
The sites listed simplifies complicated stuffs with very good visual representations and instructions. There are plenty of free tutorials that are advanced but some needs for you to be premium.
Computer-related: How to Geek
You can check rwaq in arabic and udmy in english and if you want in programming abdullah Aid and its all free and you can see yotube freeforarab it good also
The best website to offer free computer skills in the classroom,library in the hospital's,
GitHub
StackOverflow
tutorialspoint.com
topcoder
http://www.gcflearnfree.org
https://www.coursera.org
https://www.ctdlc.org
http://www.alfatyping.com
http://www.bbc.co.uk