In React Native you have two choices as of now for Navigation (only one cross platform) out of the box, as well as the ExNavigator from Exponent. We will focus on the main Navigator component as that is what most questions I have seen pop up are about, and is the cross platform navigator option. We will not talk about NavigatorIOS as it is not currently maintained by the main react native project and is only available for use on iOS. But definitely check out ExNavigator by Exponent, it is also really good.
React Native Navigator — Navigating Like A Pro in React Native
Nader Dabit

what about external libraries for navigation, do you recommend any one?

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