What is the correct way to navigate backwards between fragments?

Question

Android

There are several fragments, among them - authorization (A) and profile (B). When the user logs in, I replace A with B without adding it to the backstack so that backPress cannot return to authorization. The remaining fragments are added to the stack. As a result, with backPress, frag B is not deleted, but remains behind the fragment that preceded A.
I have a couple of solutions:
1) Search by tag / id for a fragment where it should not be and delete
2) Make the background of all fragments opaque, then it will remain, but it will not be visible
Why this happens, I understand, with the backPress FragmentManager trying to delete A, but it is no longer
there.I would like to know how to handle it in the right way.

Answer 1

There is a simple approach to this issue. When you need authorization, you use startActivityForResult() to launch an activity with fragment A (for which the NO_HISTORY and SECURE flags are registered), and catch its result.
Stop using fragments with or without reason, they are designed to make your life easier, not create new problems.