A 3-4-3 has three at the back against the two strikers most teams press with, so there's a spare defender from the start. The two central midfielders stagger, the wing-backs give width, and the front three can come inside into the pockets because the wing-backs are already wide. It's a shape that makes the pitch big for your defenders.
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Goal kick against a 4-4-2. Three at the back against two strikers: one defender is always free.
Very. Against two strikers there's always a spare defender, and the wing-backs and wide forwards give options at different heights.
What do the wide forwards do in a 3-4-3?
They come inside into the pockets, because the wing-backs give the width.
What if we keep losing the ball when we play out?
Expect it at first. Keep the shape, practise the same patterns in training under light pressure, and judge the decision rather than the result. If a game is getting away from you, it's fine to mix in a longer pass to the striker for a spell.