If you want to really nerd out on the details of how the season’s schedule is setup this year (it’s quite different than most leagues), check out this article: https://www.mlssoccer.com/news/2023-mls-regular-season-schedule-announced

Pertinent details start at the section titled “Leagues Cup Break”. Most importantly, the section titled “MLS Schedule Construction” outlines how the teams are group and how often they play each other. It’s a little convoluted.

Speaking of convoluted, here’s the playoff rules this season: https://www.mlssoccer.com/news/mls-announces-new-playoff-format-for-2023-season