Hi Anwynn, thank you for the luck! It brightened my day :D (because I'm gonna need it lol)
I used to be confused too, but jams are events where game devs either work solo or in groups to make a game/project over a restricted period of a few hours or days.
If you think you might be able to learn and make a visual novel within a month, you should join NaNoRenO too!