Here is a good example of the difference of learning something and being able to do something (after learning it).
Watch any of the 20 magic tricks from this. Now, do the trick.
[I'll wait. Go ahead, do it!]
Are you successful in performing the trick?
If you are like me, the answer is "no".
In order to perform the magic, after knowing the secret, you need to practice.
In our discussion on learning, we seem to focus only on the learning part and have completely ignored the practice part which is at least equally important if not more.
Question: how can we encourage (or ensure) practice so that the skill will reach mastery level?