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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. Strikers come in different flavours: poachers who live in the six-yard box (Inzaghi), complete forwards who do everything (Henry), target men who hold the ball up (Drogba), pressing forwards who hunt defenders (Firmino). The role has changed, and now strikers are expected to press, link play, and create for others, not just finish.

A transfer involving players going both ways rather than just cash. Sometimes straight swaps, sometimes player plus cash. Gets discussed more than it actually happens because valuations rarely match up and both players need to want to move. Sounds simple in theory but the negotiations are complicated because you need four parties to agree (two clubs, two players).