If you're trying to learn things because you missed school that day, or you just want to review some things, this is a pretty good site. The videos are pretty easy to follow, and the interface is easy to navigate and find what you need. Though, I wouldn't suggest using it as the only source you're going to use. It's not the best, but better than many other sites. (Teachers, if you're reading this, use Khan Academy instead of the dumpster fire that is Edgenuity. Just don't make your students use Edgenuity.)