What occurs if your SSL certificate is about to expire?

The website is no longer safe after the SSL certificate expires.
Browsers of visitors will show a warning that reads, "This site is not secure."
It presents a negative image of your company and website. Client trust in your website declines as a result.
You are unable to monitor the SSL expiration date on your own.
By receiving a message before your SSL certificate expires, you may be able to avoid this issue.
There are other items than SSL certificates that have an expiration date.
Your domain names and web servers are also affected.
If you manage a large number of websites, you can use a tool like Netumo to solve this issue.