akdom It affords you the opportunity to learn how to trade stocks , make mistakes and it does not (doesn't) cost you any real money . - 'to learn how to make mistakes' is ludicrous, I suppose it should be 'to learn how to avoid mistakes' Greetings, Akdom, both occurrences of it are justified in the sentence. It is true that, in the second case, it can be omitted (this is called ellipsis ): It affords you the opportunity to learn how to trade stocks , make mistakes and doesn't cost you any real money .
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akdomIt affords you the opportunity to learn how to trade stocks, make mistakes and it does not (doesn't) cost you any