Hello!
How to create a personalized login system, one that introduces the name and password?

What do you mean by "introduces the name and password"

If you are thinking of creating your own login screen keep this in mind:

in order to get to your screen you have to auto-login everybody and anybody without challenge first.  Which does exactly what it means: it lets *everybody* into your solution unchallenged before your scripting and UI takes over.  That's called 'roll-your-own' or 'ersatz' security and has traditionally proven to be very weak and easy to break.

Doubly so if you actually want to use your own table of users and passwords instead of native or external accounts.

If you want to customize the login, consider using an OAuth provider where you can customize the login page, which would keep all of it part of the native security scheme.