“Know your enemy and know yourself and you can fight a hundred battles without disaster.”
Sun Tzu
When we talk about security there are many good practices you can follow in order to minimize the risk of being hacked (strong passwords, 2FA, etc..).
One of them is being updated about past and present data breaches.
For this reason I use haveibeenpwned.com, a great free service that provides you information if your personal data have been leaked.
Knowing that one of your accounts have been compromised enables you to immediately take action (e.g. changing your password) giving you another layer of security.