Where to store data for app?

Hey guys.

I am planning to make a mobile app for mobile devices. It will be programmed in Flutter.
The app will display a list of a place, photos of it, information about it, and additional data.

The question is, where is the best place to store this data?
The information should be constantly added and modified, so all the data will be constantly updated. I don't have experience with this yet, where is the best place to store it?
Would a SQL database be best for this, or what other reasonable options are there?

Thank you for every answer.