Javatpoint.com is a wealth of knowledge site. It is a must site for all programmer including beginner to advance. Although it names in java it has lots of other language materials too. I am using this site for last four years.
Whenever I am in doubts I’ll prefer to open javatpoint.com. And I find my query easily. I am a trainer myself and I myself refers and I also recommend my students to refer it.
This site contents lots of in-depth of programming language concepts, program, example and also interview question and answer.
The front page of this site is very user-friendly. All the components are given on the front page. Any user easily finds the component according to their need.
This site loads fast. I have never face any problem regarding the opening of the site.