The following ratings are considered core ratings for each position. Things may vary slightly depending on what formation you run, and how you want to build your team.
Forwards – Offensive Instinct, Corner Kick Offense, Free Kick Offense, Dribble, Passing, Ball Striking, Shooting, Receiving, Heading
Midfielders – All ratings except Goalkeeping Instinct and Goalkeeping
Defenders – Defensive Instinct, Corner Kick Defense, Free Kick Defense, Heading, Tackling, Player Marking, Zone Marking
Goalkeeper – Defensive Instinct, Goalkeeping Instinct, Corner Kick Defense, Free Kick Defense, Ball Striking, Goalkeeping
Stamina matters to all players, it affects both how many games a player can play per season and how well they perform at the end of the game, when they get tired.
Strength, Agility and Speed matter to all positions but is not know exactly how important they are.