1 Centre midfielder (CM)
2 Defensive midfielder (DM)
3 Attacking midfielder (AM)
4 Winger (RW/LW) or wide midfielder (LM/RM)
Now let's explain each one in detail;
1 Center / Attacking / Offensive /Defensive midfielder (CM)
Central midfielders play several roles on the field of play. They are described as the orchestra conductors, the engines of the team, the players pulling the strings from the middle. They are the link between defence and attack, and must also defend when the opposite team are in possession. When his team does not have possession, the center midfielder is expected to drop back and pressure the ball. Their central position enables them to have an all-round view of the match, and as most of the action takes place in and around their area of the pitch, midfielders often exert the greatest degree of control over how a match is played. In offense the attacking midfielder should be in involved in the action by making runs towards the ball. Even before he gets it, he should already know where and how he wants to distribute it. 2 Winger (RW/LW) or wide midfielder (LM/RM)
Wingers are commonly found in teams who play with three attackers. Traditionally, wingers are strictly attacking players who stay wide, dribble the ball forward and serve in crosses. Like all attacking players, wingers need to have 'off-the-ball' intelligence, by being able to read passes from the midfield that give them a clear crossing or scoring opportunity. Traditionally, right-footed players are played on the right wing and left-footed players on the left as a matter of familiarity and comfort. However, in the modern game, coaches usually demand wingers to be able to play on both flanks and to switch flanks during play regularly as a quick change of tactics.