Harvard Extension School is, as the name suggests, an extension of the world-famous American university. And among the rather useful things that it makes available online for free is a complete course on computers and the internet. There are 9 lectures in total, each around 90 to 100 minutes long, covering aspects of hardware, software, the web, programming, and more.
Whatever your age and your level of knowledge, these are really interesting sessions that are fascinating to watch and are presented by teachers who clearly know their craft. They're all available to watch for free on Youtube. Just head to https://www.youtube.com/user/cscie1 and you'll find links to the entire collection.