Has a lot to do with the kind of app you're building.
If you're going to be relying on a lot of native device features : camera, bluetooth and that kind of thing, I'd say you go in and build your first app as an Android Java one.
If not however, then I think React Native would be the thing to dive in to, especially if you have Javascript framework experience beforehand, because it's just much more fun to do.
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Has a lot to do with the kind of app you're building.
If you're going to be relying on a lot of native device features : camera, bluetooth and that kind of thing, I'd say you go in and build your first app as an Android Java one.
If not however, then I think React Native would be the thing to dive in to, especially if you have Javascript framework experience beforehand, because it's just much more fun to do.