What Are the Key Challenges Faced During React Native App Development?

I recently started working on my first  React Native App Development project, and things are not going as smoothly as I expected. I keep hearing that React Native is amazing for cross-platform development but I am beginning to feel that there might be some less well known challenges you encounter with React Native that you are not made aware of upfront. Have any of you experienced any serious difficulties with your React Native project and how did you overcome them?