Some leagues give bonuses for number of completions, rushing attempts, and receptions. If that is the case, look for players at these positions who have higher amounts of these actions than others. On the other hand, some leagues give negative points for interceptions. The only special teams points that are allowed usually is for kickoff returns for touchdowns. I would not invest too much time into knowing what team dperforms the best in this area.
Most fantasy leagues combine defense and special teams.
If you pick Seattle as your defense, they are also your special teams selection. Some of you might ask why I would write about this. I know tipping some brews with your fellow mates is a lot of fun. But, I have casually noticed on several occasions when general managers consume beverages of the alcoholic nature, it ends up showing in their draft choices. I can almost guarantee if you stay sober, you will draft better than if you were not.