My application is about the sports teams of my town. My question is if there is any way that I can update the application without the need for other users to download the application every time I make a change.
You can update the data in your app by using an online resource (google sheets, firebase, mysql, cloudDB, others) and call in the new data from the app. HOw you do this is all over this community, suggest you start with the FAQ.
you can easily use cloud DB, spreadsheet, firebase, tiny web DB and others to update your information at any time (with internet)
Do you mean literally change the GUI and/or code?
Here's one way, using the Spreadsheet component:
Both
Well, if you change the App and you want the Users to be up-to-date with the change, they will have to download it.