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for micro soft technology like ASP.NET, C# goto www.asp.net and c-sharpcorner.com
It's W3School and really it's very useful
codecademy
code school
khan academy
scratch 2.0
Edx.com
W3school.com
Coursera.com
For online courses >> Coursera, Edx, and Udacity.
for questions and help >> https://stackoverflow.com/
or https://github.com/
For Asp.net, C# - W3School, C# Corner, Kunvenkat Youtube Vedios, stack overflow
I prefer microsoft technology so i like c#
for MOOCs, Coursera, Udacity, Udemy, Datacamp
for questions, stack overflow
for basics, W3C
Personally, I highly recommend Lynda.com.
The lessons there are provided by industry experts. Also, you can choose a learning path such as Become a Front-End Web Developer, Become a Ruby on Rails Developer, ... etc.
check all that available paths on the following link: https://www.lynda.com/learning-paths/web
Also, I find W3schools and Tutorialspoint very useful and free.
CodeAcademy
W3School it is very Useful for fresher and as well experience.
and important google software forums