Gold key and silver key

I got 3 gold / sliver key , but I don’t know how to use it , Could any one pls tell me how to use them and what is the benefits ?
And thx t y

There my are for the ingredient missions
Sorry my phone autocorrects the keys are for the ingredient missions

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When I first started I was afraid to use them at first too, I thought they were the only ones I got in the whole game or something. But don’t worry, if they’re not capped, you get 1 silver and 1 gold every 24 hours. The silvers are for ingredients, and the golds are for youth fruit and silver. 

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