Understanding beats rote learning every time: it's always possible to reconstruct the learning. You can generalize and customize it. But how much quicker if you

Understanding beats rote learning every time: it's always possible to reconstruct the learning. You can generalize and customize it. But how much quicker if you also have that at your fingertips! Perhaps, a bit like writing a very clear and well thought-out solution on SO... and later googling for it.