Class vs ID


For "12. Build a Resume" section 2 "Laying out your divs", why would we create an ID for header and footer, but a class for left and right. Is it because you could have multiple divs that are left and right but only one footer? Thanks!


I never understood why the creator of this course decided to add left and right as classes, they are pieces of the fundamental structure of your webpages, i would have used id's for left and right if i had a choice.