How To Add Aso Keywords?

I dont understand how or where to add it, Im in Android but later I will publish my app in the Apple App Store.

 

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For Apple Store: In iTunes Connect, click the app you want to add keyword. Then click to Version or Platform. Under screenshots you will see Keywords section. You should add keywords there.

 

And for the Android Developers Console?

 

Google Play developer console. Keywords come from your Description.
So Keywords you want to use, try and repeat them a couple of times, But make sure it doesn't make your description sound stupid.
Be logical, if you spam a keyword in your description, it will get over looked, detected as spam.