What should be the secure login and registration of users on the site?

Question

User identification

The essence of the question is not how, but how, in theory, you can protect the entrance and registration to the site. Take into account that the site will have an SSL certificate, and user data will be stored in a cookie.

Answer 1

Hello,
protect from what? From DDOS? From hacking at the level of code or user information?
In theory, protection is a whole complex of different measures:
- updating software and operating systems,
- prohibiting simple passwords,
- protecting against DDOS,
- encrypted channels when transferring data between the server and client,
- etc. etc.