I developed a mobile application on React Native expo and don't know how to convert it to apk file now, how to do it?

Question

Android

I developed my mobile application at React Native expo and don't know how to convert it to apk file now. Resources like - https://facebook.github.io/react-native/docs/signe... didn't help at all. I did not understand anything there and it was all incomprehensible to me. I don't understand what gradle is. I generated a keytool and then they ask him to drop it into some Android folder. Long story short, I didn't get in. Can you please describe in detail what and how I should do. I've been struggling with this for 2 days now. Many thanks in advance =)