A recent data breach incident gave us an example of how trying to be careful in one respect can lead to unintended bad consequences in other ways.
You keep your home safe, don’t you? So there should be no problem taking some work notes home, rather than travel the extra distance to drop them off at the office at the end of the day; or to have to pick them up in the morning at the office. You are saving time and avoiding unnecessary travel. But homes do get burgled, thousands in any month.
Computer systems always seem to have problems and vulnerabilities. Some data breaches occur because of those vulnerabilities. If you spot a vulnerability or security flaw in a website, you can first report it to the organisation. They are generally happy to hear about a problem, so they can fix it.