Earlier this week, Football Outsiders released their annual Almanac for 2021, and I highly recommend picking it up. It’s a great resource when prepping for fantasy drafts (the rookie projections, and baseball-style “Top 25 Prospects” are invaluable, and have won me leagues before), but my favorite part is the breakdown of each team’s various offense and defensive tendencies from the previous year.
Football Outsiders will tell you how much a team used play-action, how often they lined up in 11 or 12 personnel, how often they used pre-snap motion, and even more esoteric stats like how often they ran the ball on 2nd and long and how effective they were in doing so.