Expo is a platform build on top of React Native, that allows you an easy and fast process of making React Native Apps in the cloud. We also use expo app compilation process.
You will need to create 2 expo.io accounts
Both of the accounts shouldn't have complex or private passwords and usernames
1. For the Preview account, we have
2. For the Build account one, we have
They should be like this because your clients will sign it with them, to preview their app and build the apps they have.
Take note of the values, later on, you will need them.