Data Breaches happen often some of them massive like the equifax breach which effected 145.5 million which is close to half of the population of the US. how does one keep track of if their data has been breached and they might not know. With how many accounts we all have its hard to check every single one constantly. A good place to start is to sign up with https://haveibeenpwned.com they send out emails when your data has been found in breaches and data dumps. A good way to do a little more then try to monitor every account you have. Then if you get an email saying your data was found in a dump you can go change that info right off the bat. Also a good reason why not to use the same password for everything because if it comes our in a dump they may very well be able to get access to every other account you have.