Own authorization system in django?

Question

Django

I wanted to make a mini site for myself, where, in addition to everything, there will be registration. First, I made my own registration and login system (adding data to the database, and comparing them when logging in), when I tried to find how to make the page display only for authenticated users, I came across built-in models that can be changed for myself, and now I have head is a complete mess. There are a lot of questions at once, sorry for their possible meaninglessness.
1) Is there a difference between my own and created through some UserCreationForm, LogInViews, LogOut views and what is the difference. I just don't understand anything anymore.
2) How is it better to make a registration and login system after all.
3) Still the same my very first question 'how to make the page display only for authenticated users' so that there are no bugs.
I would also be happy for links where you can read / see about all these already existing models, because everything I find confuses me more and more. as I understand it, there are many such models more or less the same.
Thanks in advance

Answer 1

About "your own system" is well described in the off-docs https://docs.djangoproject.com/en/3.1/topics/auth/... But before writing your own authentication, you need to learn how to use the standard https://docs.djangoproject.com /en/3.1/topics/auth/...

Answer 2

Registration and authorization are in Django out of the box, there is no need to waste energy on reinventing the wheel.