This is totally dependant on where you host your website. It will vary depending on your hosting environment.
You will end up with a development target and a production target. All development gets done on the development target and only publish to production when ready and tested.
If you aren't using a third party database app you will be using the Wappler database manager. There is documentation and videos on using that. If you are not familiar with databases I would use the DB manager.