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The First Rule of Learning:

You get good at what you practice

Corollary:

If you practice the wrong thing, or the wrong way to do the right thing, you will get good at that instead

Commentary:
The are domains where it is best to perfect form first. There are domains where it is best to go out and experiment, letting form work itself out. In the overwhelming majority of domains a combination is most effective. You should constantly vary how much of each you do, and pay attention to the result, because determining the optimum balance is a nearly pure experimentation domain.