Sass section seems wonky

A really specific question:
what is the difference for the two examples in the beginning of this lesson:
https://learn.freecodecamp.org/front-end-libraries/sass/use-each-to-map-over-items-in-a-list|

Also what is a map in CSS? It sounds sorta like an array?

Just my opinion, but the Sass section seems to need more attention from a writer. It’s been the hardest to follow out of all the classes I’ve taken here on FCC so far, and I’ve done the JavaScript section.

Ahhh, an array and an associative array. Thanks.