Kids learn everything quickly compared to adults, and are almost always willing to make mistakes at a much higher rate than adults are. Language starts with "babbling" I think it's just as important to "babble" in anything you're trying to learn.
So true. Tinkering, Babbling, call it what you like, the path to mastery begins with play.
Side Note: This is why programming languages which have a REPL (Read, Eval, Print Loop) win.