Use the "passwords" feature to check if one of yours is compromised. If it shows up, never ever reuse those credentials. They'll be baked into thousands of botnets etc. and be forevermore part of automated break-in attempts until one randomly succeeds.
Lucky you, I've been in at least 21 confirmed breaches so far.
Which I don't really care about, as I've been using unique passwords and a manager for well over two decades now. 178 of them, currently. ...half to websites that probably died a decade ago.