"Experience is a complicated coach because she give the try-out first, the lesson afterwords" Meaning?

I have to write an essay on it, and I've ran out of ways to say the import of the quote. I've written like three pages already and I'm almost done, but I'm at a loss for words as to what to put next. Can someone distribute me a brief explanation of it? Your help would be very appreciated. :]
experience comes from your successes and failures. you just find out if your choices were good or bad when the dust settles and you own the chance to reflect.

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