There's a large collection of educational channels which look quite useful. They are collected from around the world, so not all in English, so if you are looking for educational materials in other languages this could be a good place for you to come too.
Other sections include;
There's also a sort by country feature, so if you want something from a specific country for a specific language or accent, you might find something useful here.
Here's the link to the Educational section
You can find the selection of country sources here
For the rest, just use the navigation bar along the top.
Hope this is useful