You can buy Defending For Dummies in paperback online, but we have to hope Pep Guardiola and Carlo Ancelotti didn't add a copy to their baskets this week.
The first-leg clash between Manchester City and Real Madrid was thrilling, in part because of the defensive naivety on show.
The neutrals among us want to see more of the same tonight - two awesome attacking sides going head-to-head.
Manchester City need to cut out their defensive mistakes if they are to beat Real Madrid
That isn't what Guardiola needs, mind.