It's something quite useful to be able to verify that the contents of a message are actually coming from a specific person (or at least someone that has access to that person's private key).
If you haven't done so, you can learn how to do it here.
Basically all you need is the software that you normally use, like Electrum for example. You can then either verify or sign any message.
I feel like this is not well known, but it should be.