I have searched for the words Hand Crossbow and Crossbow Expert but didn't find this Q&A, which is awkward as it's cited many times.1
The Crossbow Expert feat states:
When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a hand crossbow you are holding.
A hand crossbow is a one-handed weapon, so if you attack with it, can you attack again with the same hand crossbow as your bonus action?
1 As I said, the answer itself is cited in many other questions, but I didn't find any question that actually asked it. I think the question itself is useful so people can easily refer to it, and possibly we get less "dual-wielding crossbow expert" questions with answers clarifying that they don't need the second crossbow.