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stack over flow
https://stackoverflow.com/
because It has several programming languages
depends on your interest and purpose, but generally I would suggest a website where you can acquire new knowledge from the experience of people.
Quora is great website where people ask about almost all kinds of social/professional aspects and you get answers by amatures, professionals, and experts.
https://www.quora.com
https://www.yahoo.com
http://www.cnn.com
http://www.adsoftheworld.com/
the best website is to visit bbc news where every one can see current affairs of country and lot more stuff.
iCrank.com and
ASME.ORG.
because they are Ultimate Online Reference for Engineers.
The good website to visit every day is Shopping Sites
