There are moments in which classroom instruction is not enough to help you understand the topics you’re studying. In those situations a little external support is always welcomed. But where can you find it? You could try iTunes U.
iTunes University is a service from Apple that allows colleges and universities to upload content to iTunes. This content can then be transferred to an iPod or watched (or listened) directly on your computer. Hundreds of universities currently make available courses and lectures for anyone to download. All you need is iTunes and some time to search.
Here’s a short tutorial on how to conduct a search in iTunes U: