This site is the best information source I have ever seen. Most of the courses are paid and quite expensive but they offer the courses in sale for$10-14 which is worth the course and give a lot to learn from.
Me and my friends have enrolled to The complete web developer course 2.0 by sir Rob Percival and have never felt like I have wasted the money. He is a great teacher and that is the best web development course I have ever seen in my whole life.
I am sure the rest of the courses are also as good as this one and I love the variety of course it offers ie. from mba to tech courses everything is offered by these guys.