Monero TX info

[RapTarX]

Till now, I haven't used Monero (XMR). In XMR transaction, privacy is forced; I mean it's not optional. For that reason, you can't find out who send whom or how much (I might be wrong).
If that's the catch, is it possible someone to lie that they have sent me XMR? How can I verify that?
Seems like it's a very noob question but I have no idea about it.

[Bttzed03]

This article might help you https://www.getmonero.org/resources/user-guides/prove-payment.html

[Yaunfitda]

Or maybe this post from reddit, post can also help you out,

How to verify whether or not Monero was sent to me?