One further thought..

It's worth getting to know the rudder so that you instinctively use it if you suspect that the wing has stalled and a tip stall is imminent.

As a tip stall approaches (say, on landing) there's a real possibility that the ailerons will work 'backwards' as part of the wing has stalled. The rudder almost never stalls, so that should be used to correct roll.

If, say, the left wing drops when the wing is nearly stalled, and you apply right aileron, the extra drag you are adding on the left wing (more lift always equals more drag) will make it 'dig in' more and thus not lift the left wing to correct the roll, but make it drop even more and it flips over onto its back.

-David C.