Thanks for this post!

The active key is generally anything relating to financial transactions. This means it is used for transferring funds, powering up and down, trading on the market. It is also the key you use to vote for witnesses. Witnesses are the representative officials in Steem's system of governance.

Otherwise, you have demonstrated sufficient understanding of the keys and their functions. I would add that the master password functions similarly to the owner key, and can be used for account recovery in some situations.

You are ready to move on to achievement 3!

Best regards!
@cmp2020
Steem Greeter