The Online Writing Lab at Purdue (known as the “OWL”) has a YouTube Channel:
https://www.youtube.com/user/OWLPurdue
And, for future reference, there is even a sub-channel for how to use MLA style. You will need this a bit later in the semester for your Research Papers. Best to look now:
https://www.youtube.com/watch?v=24Y31UrG2q4&list=PL4917D9E21FA6EDFF
As long as we are exploring the OWL, here are some exercises on comma usage that we will be doing in class:
https://owl.english.purdue.edu/exercises/3/5/15
And, by the way, we ought to tell you the Rules of Comma Use! Here you go: