About a DropBox-style web system (but not for storage), where the user logs in and is already redirected to his HOME where he has access to his resources.
Some idea how to work with this information, how to create the tables, because I do not know if it is best to have a base only and work with prefixes or if each user would have his / her own table.
In PHP you will work with the implementation of "SESSIONS" and "CONNECTION WITH THE BANK", it is only from a small survey that several contents as well as ready systems will appear for you.
Regarding your database doubt, I think you need to study a little more about relational databases and how to model a good database.
You do not need to create a database for each user, just establish the entities necessary for the system and their relationships.
