If you are using Firefox (my preferred browser especially on older versions of macOS), you're in pretty good hands. While there are no more security updates for High Sierra 10.13.6 there are updated releases for many apps you use, especially your browser, which I consider front line protection. Here's a useful article from Boston University about protecting your web surfing: How to Identify and Protect Yourself from an Unsafe WebsiteĪnd here's a article from PC World about The 17 Most Dangerous Places on the Web. If you open an email don't click links, don't open attachments and don't reply unless you are absolutely certain the email is legit. If it's in the least bit suspicious send it right to the trash without opening it. Scammers are getting better & better at making their emails look legit.
Second, always be careful with emails you receive, even if they "appear" to be from a known sender. The more risky sites you go to the more likely you could be the victim of a pfishing, trojan or other scam, so my #1 rule is always be careful about the sites you visit! One of the most important things you can do to maintain your security and privacy is to be careful what you wander through on the internet. Even though you are on an older version of macOS you are still fairly secure as long as you are careful what you do online with your Mac. I appreciate your concerns about security! I am also still running a Mac with High Sierra.
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