I would love some up-to date indexes and resources regarding Pretty Good Privacy.
https://en.wikipedia.org/wiki/Pretty_Good_PrivacyWhat are PGP Keys?
In asymmetric cryptography (just like in bitcoin) you have a key pair. A private key that you use privately to sign stuff or decrypt encrypted messages. A public key that can be published publicly that others use to verify your signatures or encrypt messages that only you can decrypt.
What are those numbers that people display on their profile or signature?
It can be a lot of things!
What are Signed messages and how do I create them? Notepad file? I'm really lost on that part.
With an application that has the option to sign messages! PGP is installed on most Linux distros by default and Kleopatra works on windows.
I understand that the use of PGP is essential in the Bitcoin community
The only use case it has is when people want to verify signature of wallet binaries, otherwise it is not really essential.