Why Your Browser Shows an SSL Certificate Warning and What It Means

https://smart-wiki.win/index.php/Why_Your_Browser_Shows_an_SSL_Certificate_Warning_and_What_It_Means

When you see an SSL certificate warning in your browser, it means the website's identity couldn't be verified or its connection isn't secure. This usually happens because the certificate expired, was issued for a different domain, or comes from an untrusted source. It's your browser's way of telling you that information sent to or from the site could be intercepted, so you should avoid entering sensitive data like passwords or credit card numbers until the issue is resolved.