https://www.digicert.com/blog/not-se...ng-what-to-do/
QUOTED FROM THE ABOVE LINK:
"For Website Visitors
The reason you are seeing the “Not Secure” warning is because the web page or website you are visiting is not providing a secure connection. When your Chrome browser connects to a website it can either use the HTTP (insecure) or HTTPS (secure).
Any page providing an HTTP connection will cause the “Not Secure” warning.
You should avoid conducting any sensitive transactions on these pages—such as logging in, providing personal information, or payment information—browsing insecure sites could put you at risk if you are viewing information that is dangerous or not condoned in your country.
As a visitor, you cannot fix the cause of this warning. The only way to solve the issue is for the website operator to obtain an SSL certificate and enable HTTPS on their site. This will allow your browser to connect securely with the HTTPS protocol, which it will do automatically once the website is properly configured.
If a site you frequently use is displaying the “Not Secure” warning, you should contact them and ask them to start supporting HTTPS. You can also try manually replacing HTTP with HTTPS in the URL, as some sites may have partial support for HTTPS but don’t offer it by default.
Note that even with basic browsing over HTTP—such as looking at recipes or reading news—what you are looking at can be monitored, modified, and recorded by entities, such as your ISP or government. This effectively means you do not have any privacy when browsing such pages. On public Wi-Fi networks, like at a coffee shop or airport, there is an additional risk from ‘local attackers’—other computers on that network—which are able to view and monitor the pages you are looking at, the information you are sending them, and what you are searching for."