Well the first website comes up to my mind is TED.this website ws recommend by my English teacher.she found that a lot of students on the class are tired up with textbooks .so she suggested us to watch some videos on this platform.

T is short of Technology '''E'''entertainment, and '''D'''design"), TED is a conference series held by the Sapling Foundation, featuring talks by highly varied guests

This website includes various English videos such as ted talk ,some famous speach ,classe offering by top schools.

For example,you can learn harvard 'classese on this website.it is an good access for students to access to some high quality education.