Super new and need some help

hey so i need help making an app, i have tried many methods of app development but they have all had some problems. i would really like this to work but im having three issues, i would like to tackle one at a time. so first off how do i make a text box that when the numerical input is changed automatically saves that change when returning to the app?

You can use tiny db for this.

When text box text changes use tiny db store value block and value to text box text.

When screen initialise set text box text to tiny db get value.

This will show same text in the text box which the user typed last time.