That South Africa have been taken to Test cricket school by England for the past month is old news. But going to school means learning. So, what have South Africa gleaned from their opponents, who won the series 2-1? 1. It takes a teamEngland attacked their challenge as a unit. SA depended on too few players.2. History strikes twice, but not always in the same place"England have four frontline seamers and a spinner," Proteas coach Russell Domingo said. "SA don't have that luxury any more. They've got Ben Stokes, who gets hundreds and five-wicket hauls. Jacques Kallis used to do that."They bat to No13. They have a seriously skilled bowling unit. They've got an experienced captain who's nearly got 10000 runs. They've got what SA had a few years ago."3. Oh captain, our captain ... Whatshisname?Yes, Hashim Amla took a brave decision to resign the captaincy bang in the middle of the series. Yes, AB de Villiers is probably the best choice to replace him - at least for now.Few teams are successful without strong leaders.Alastair Cook had a forgettable series with the bat, but he knew how to get the most out of his men.4. Specialists are specialSA's lack of a specialist opener to partner Dean Elgar stuck out like a single-speed bicycle on a freeway.5. Trust in flairEngland are not known for their creativity, but they out-created SA by trusting in players like Stokes and Bairstow and even Hales.SA, by contrast, looked like they were grasping at the straws of how things have been done for decades...