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How good the backup players are when starters get injured or rested. Deep squads can rotate without losing quality. Shallow squads fall apart when key players are missing. Manchester City's depth means their B-team could challenge for titles; smaller clubs rely on 11 players and pray they stay fit. Modern football's congested schedule makes depth more valuable than ever.

The foot that stays planted while you kick with the other. Where you place your standing foot affects the direction and power of your shot or pass. Too far from the ball and you lean back, skying it. Too close and you can't get a clean swing. Coaches drill standing foot placement into youth players because it's the foundation of good technique.

Moving your foot over and around the ball without touching it, creating a feint to throw defenders off. Also called scissors or "pedaladas." You can do one or string several together, like early Ronaldo at United, who would do four or five in a row. At speed with a sharp burst afterwards, it leaves defenders stuck. Do too many and your teammates start getting annoyed.

The player whose job is to score. There are different types of Striker: poachers who live in the six-yard box (e.g. Inzaghi), complete forwards who do everything (e.g. Henry), target men who hold the ball up (e.g. Drogba), pressing forwards who hunt defenders (e.g. Firmino). The role has evolved a bit, and modern strikers are now often expected to press, link play, and create for others, not just finish.

A type of run-up that some players make when striking a penalty kick. Ronaldo perfected the stutter penalty. It offers greater control over the ball but loses out on the power of a long run-up, also playing mind games with the keeper, waiting until the last moment to strike the ball, hoping that the keeper dives first.