If you are struggling to find exactly the material you are looking for, try Open Culture’s listing of free online education courses. The page highlights 1000 lectures, videos, and podcasts from universities around the world.
The site features a lot of material found only on universities’ private sites, all in easy-to-browse categories. This means you can find hundreds of university courses without having to visit and search each university’s site.
Open Culture’s list features courses from England, Australia, Wales, and many state universities around the United States. It’s a very helpful resource for finding many courses in one area of study.