Most of keepers in game have trained Penalty stopper and Setting walls.
Central defenders - Man marker and Correct, same for defensive mids. Wing defenders have mostly Winger. Corner stopper is also widely used for defenders
Midfielders (non-defensive) - Playmaker is "must be", some train "Winger", but none of those mids is absolute top class. Another quite common attribute in that line is Set Pieces specialist, but typically not on every mid.
Forwards - Long shots is most common, Poacher and Sharpshooter are maybe next, one of forwards should have also Penalty specialist.
Several attributes are widely used on several positions, but best way is to research players of absolute world top teams- they can't do it very wrong. Surely pay attention that some born attributes show where to use this player: Selfish to forward and Team player to mid. Agressive players go mostly to wing defenders.