Reusing the same password on multiple sites can be incredibly risky. Most people reuse the same credentials for different sites because they are not aware of the potential impact. This means that if your password for one site is hacked, it could be used to get into your accounts for multiple sites.
The website https://haveibeenpwned.com can tell you if your password or email has been exposed in a data breach. This website is safe and is used by many IT professionals. It uses a database of previously leaked emails and passwords to give you a count of how many times your data has been exposed.
Email Check: https://haveibeenpwned.com/
Password Check: https://haveibeenpwned.com/Passwords
IMPORTANT: Make sure you use these verified links or double-check the spelling of the URL before you input any emails or passwords into the site.