How can I make a profile update page?

Question

A page like fb, insta oand many more
in which users are also able to update their profile picture..

Answer 1

Usually you must to have info in a database.
1 - Make form to register and save data in database.
2 - Make page to show information from database.
3 - Make form to edit or modify profile from database.

Answer 2

You have to use Firebase.