You need to know your problem. You need to know which routines will need to be created within the app. You need to know what information will be saved in the database. You need to design your database. Decide whether to be a relational or non-relational bank. If it is relational, you have to define your primary and foreign keys in addition to the Trigger and Store Procedure (if necessary). If it is not a Relational bank (I can’t explain what you need kkkk ) You need to know programming logic. You need to know your app’s building algorithm. You need to get in and get to know Kodular … Anyway …