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Frequently doing something makes one better at doing it, as in I've knit at least a hundred sweaters, but in my case practice hasn't made perfect. This proverbial expression was once put as Use makes mastery, but by 1560 the present form had become established.
American Heritage Idioms
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Phrase(s): Practice makes perfect.
Prov. Cliché Doing something over and over again is the only way to learn to do it well. • Jill: I’m not going to try to play the piano anymore. I always make so many mistakes. Jane: Don’t give up. Practice makes perfect. • Child: How come you’re so good at peeling potatoes? Father: I did it a lot in the army, and practice makes perfect.
McGrawhill's American Idioms And Phrasal Verbs