How to properly delete/terminate an activity from another activity?

Question

Android

Hello.
On the first activity, the user enters a phone number and goes to the second one, where they need to enter the code from SMS. In this case, the first activity is not deleted so that the user can return to it (for example, if he entered the number incorrectly).
If the user enters the correct code, then the transition to the third activity is carried out. When transitioning, I can call finish() on the second activity (with which the transition is made), but what about the first activity? how to remove it correctly?

Answer 1

I use always 1 main activity (mom) which is never deleted. From it you can go to 2.3 ... and so on. But the main one always works. Try to structure like this.