How can I learn to make a user login?

I've read this tutorial on making a simple user registration form. But what about a form for just logging in existing users? I can make a registration form with `views.py` looking like this:

 registration_form.save()
 email= registration_form.cleaned_data.get("email")
 raw_password= registration_form.cleaned_data.get("password1")
 user= authenticate(username=email, password=raw_password)
 login(request, user)
 return redirect(home_slug())

Is there an example of how to make the backend for logging in users?

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