You can find various information and tips on Google.
It is questionable if you use the Norton Password Manager. Then your passwords stored there could have been discovered. Even if you use the same email address and the same password for other accounts as for Norton, this could be a security problem.
However, Norton should have informed all affected users.

Great. What does that mean for me and my devices now? Delete everything immediately? Reformat? Demand money back for the 2-year subscription?