Wikipedia is a online site that only a few may not be knowing. It provides with the best of answers to all your questions. Nothing is there which cannot be found on this website. There is not a real competition to this site. Its one of its kind. It is the best educational website that not only helps students in their project work but also assist adults in their office work. The user experience on this website is quite good. The only thing being that it would be nice if you were provided with suggestion on reading various topics which you could find intersting.
It has solutions to all your questions and will help you everytime. I have been actively using this website and can recommend anyone easily.