: To avoid reuse, use a manager to generate unique, complex passwords for every site.

: Immediately update your password on the affected service and any other account where you reused that same password.

If you find your information in a combo list or receive a notification from services like Have I Been Pwned :

: If your email appears in such a list, it means your credentials for a specific service have been compromised. Notable Examples

Experts from InfoStealers and Group-IB identified it as a mix of old combo lists and credential dumps rather than a fresh malware-driven breach.

If you are looking at a text file titled "8 Combo.txt" or similar, you are likely dealing with a —a plain text file containing large sets of username (or email) and password combinations. Understanding "8 Combo" Files

: These lists are compiled from multiple security breaches and leaked databases.

: If the leak is suspected to come from a "stealer log" (malware-based), run a full antivirus scan on your computer.