There is a website where you can check if your credentials of any website have been compromised for free.
It is called Have I been pwned. To know if any of your credentials have been leaked and exposed on the internet you just need to perform a search of your email or username. It will tell you if your account has been stolen at any time, at any website for free.
This tool has been very useful for me, because my accounts have been compromised in several data breaches, for example Adobe and LinkedIn data breaches.
Be aware of when your accounts are leaked
It is also posible to set up alerts in order to be notified every time any of your accounts are compromised. Then, it easy to change the password and keep your account secure again.
Hope this post have been useful. If you found this post interesting, feel free to follow me, I will be posting more security advice and tools.