A. First, anyone could check out at the Equifax site to see if impacted by the Equifax data breach or not.
If unfortunately you are impacted, the best action is to freeze your credit at all of the 4 credit bureaus (4 large ones, 1 small one) -
You might also consider putting a freeze on at the consumer agency ChexSystems - this is the bureau that financial institutions use to verify that you have a good history of managing bank or credit-union accounts.
Why credit freeze? It's regulated at the state level, while credit lock is enforced by each credit bureau only.
Why not signing up for TrustID? It's a credit monitoring service, which means it only notifies you after something bad already happened.