introduce sites for improve programming skills

heyy!
first of all can u please tell me what type of programming languages u want to learn, then i can suggest u better.
but in general u can follow these:
http://www.w3schools.com/
http://www.tutorialspoint.com/
http://channel9.msdn.com/

:)

Also check below urls
 http://msdn.microsoft.com/en-us/library/67ef8sbd.aspx
http://www.codeproject.com/

you can check articles and blogs on this site