Khan Academy offers an ever-broadening list of subjects. You can learn about everything from finance to quantum physics. Not only that, but every lesson I've ever seen has been in an extremely accessible format for a broad range of users. Also, I use it at my job to help students learn new topics with the help of interactive videos which helps them in being engaged and interested in the topic.

I like all the math lectures and exercises

I love Sal Khan's explaination. I understand it quite well.