Buying hosting
You'll need a place on the Web to put your files. The examples in this course - the screenshots and so on - were made with an account on Reclaim Hosting.
Reclaim specializes in serving students and universities. A basic account costs $30/year at the time of writing. A domain costs another $15/year. A domain is something like tastymonkeybites.org. You need both hosting, and a domain, for a total of $45/year.