Thank you for explanation. Usually account on the other sites has only one password but in situation with Steemit it is easy to get confused. Not only that, there are already 4 of password, each of them can be shown as a public key or as a private key.
Yes, as you can see all those passwords have purpose and used for different reasons. As for public keys, they are visible to everyone and used for communication and verification purposes, nothing to worry about. Private keys are not visible to anyone and only accessed by you. Although you have 5th, the main password which can be used to change all other 4 private keys...