Dramatic structures are there to help you. They organize your script and help you get to the right beat. If you're the outline kind of person, that's what you start with. If you like to just start writing and see where it takes you, structures help you make the right turns at the right time.
Usually, they throw at you 3 acts or Hero's journey and leave you to dry. This time, we'll look at 6 and their application to the same fabula.
NOTE: This is Puzankov's pack. That's what he uses, or is eager to check out, or simply can't stop thinking about. Mileage may vary, other people will have different ones.