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Actively closing down opponents to force mistakes or win the ball. You can press high (in their third), in a mid-block (middle of the pitch), or low (in your own third). It only works if everyone does it together - one player pressing alone just leaves space behind them. Klopp's Liverpool and Guardiola's City have made it central to how they play, using pressing as the first step of attack.

A stat that values how much a player increases their team's chance of scoring through their actions. Unlike xG, which only looks at shots, xT gives every zone on the pitch a threat value. Move the ball from a low-value zone to a high-value zone - through passes, carries, or dribbles - and you generate xT. Useful for rating midfielders and ball-playing defenders who progress play without necessarily shooting or assisting.

Running outside and past a teammate who has the ball, usually a full-back going around a winger. Creates a 2v1 against the defender, who has to choose between following the runner or staying with the ball. Even if the pass doesn't come, the threat of it stretches the defence and opens space to cut inside. One of the most basic attacking moves, taught from youth level, and still works at the top.

A clause giving the selling club a percentage of any future transfer fee. If you sell a player for £10m with a 20% sell-on, and they're later sold for £50m, you get £8m (20% of the £40m profit). Smart for clubs who develop young players - you benefit from their continued success even after they leave. Can complicate future deals though.

A large group of players owned by one club but loaned out to others, sometimes dozens at a time. Chelsea at their peak had 40+ players out on loan. The logic: develop youngsters, maintain asset value, collect loan fees, maybe find a gem. Critics say it hoards talent and blocks pathways at other clubs. New rules have been introduced to limit it.