The best login and authorization concept

I know that a professional and complete secure login and authorization system requires a lot of work. I have looked at a number of ready-made solutions that were used in CI3, but before that most of them were overly developed for my needs, and not compatible with php7 and the general CI4 concept. I want to start with the basic functionality and gradually expand. I mean basic assumptions, eg a good solution is to create a controller base class and check everything in the constructor or perhaps build a separate library and attach it to the controllers like DX-auth. I am not a CI4 specialist so I would like to point the direction of a professional or go in the right direction. Or is there any ready-made library worth recommending? I just found something like this
Gatekeeper: An Authentication & Authorization Library
However, as for me, it is extremely extended. And while creating your own concept, I would like to learn something more