Football101: Positions

I've been following football for a couple of months now, yet i still haven't familiarized myself with the different kinds of defenders, midfielders and forwards and their roles. so apparently, i had to google it.

Defenders
Centre-backs: stop opposing players, particularly the strikers, from scoring, and to bring the ball out from their penalty area.

Sweepers: more versatile type of centre back that "sweeps up" the ball if the opponent manages to breach the defensive line.

Full-backs: prevent opposition players crossing or cutting the ball back into the penalty area. In some defensive systems, they mark opponents. Most of them are also expected to provide an attacking dimension by getting upfield along the wings and providing crosses.

Wingback: modern variation on the fullback with heavier emphasis on attack.

Midfielders
Center Midfielders: are the link between defence and attack, and must also defend when the opposition are in possession. They also often exert the greatest degree of control over how a match is played.

Defensive Midfielder: tackle the ball away from the opposing team's attackers and midfielders and to safely distribute it to more attacking-minded players.

Attacking Midfielder: create goal-scoring opportunities.

Winger (left or right): beat opposing fullbacks and to deliver cut-backs and crosses from wide positions.

Strikers/Forwards
Center Forward: score goals.

Strikers (as opposes to center forwards): make runs to beat defenders to try to beat the offside trap and play close to the goal area.

finally, Deep-lying Forwards: somewhere between the out-and-out striker and the midfield. (this i don't quite get.)

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1 book down, 4 more to go. I finally got my copy of The Thinking Fan's Guide to the World Cup today. My sister picked it up for me in Fully Booked.

PS I want the Chelsea home kit. Badly.