App keeping users record

I am building an exercise app, and will like to keep users progress record. For example, when a user completes stage one, and leaves the app. I want to stage one to still carry a mark that says completed. Please can anyone help me on how to achieve this.

You can use tiny db for storing users data. But you can’t do in background when app is closed. Use tiny db, it’s too easy to use, and set your stages level according to user progress.

Please can you show me an example of how to use it.

Can you explain me but more about your app. You can sent it to me privately if you don’t want to share with anyone or you can also contact me on telegram Ricky720M