If you are wondering if your information was exploited from one of the major hacked websites, there is a website that may tell you that.
https://shouldichangemypassword.com/
It checks several databases for the occurrence of your email address. If your address is there, you may need to be concerned. If not, carry on…
I checked most of my email addresses and those of my family without finding one, but I did check a few that belong to friends and clients and found one.