Public-key encryption uses two keys that are generated together as a pair:
A public key you hand out freely. It can only lock.
A private key you never share with anyone, ever. It can only unlock.
Picture a mailbox on the street. Anyone can push a letter through the slot, which is the public key. Only you have the key to open the box and read what is inside, which is the private key. Publishing the slot's location tells an attacker nothing useful.
The rule that never bends
Your private key never leaves your machine. Not into chat, not into a config file in git, not into the secrets manager itself, not into a support ticket. Every design decision in this tool exists to make sure it never has to.