This course taught me how to actually make a web page! I learned about and wrote 'server-side' code and used Google AppEngine to host my page.
Networks (like the internet) are made of a bunch of links between 'nodes'. Information can be sent on a network by passing it from node to node until it reaches its destination.
When you type a URL into your browser and hit Enter, a 'request' gets sent to a server. The server handles that request and sends back a 'response'.