How to replace the SSL certificate when it expires?

The SSL certificate of the website is about to expire. Now you need to replace the SSL certificate because it was used for free before, but now you need to use the paid SSL certificate. How better to use the replacement process, what can be replaced, and how to operate it successfully? Is it convenient to replace? It's also my first time to do it. Thank you for your guidance!

Additional questions
    3 participants
 Pushing frog
Pushing frog · He is good at SEOSEM procurement diagnosis, scheme preparation, and optimization of operation and maintenance. WeChat: tuituiwaseo

1. You choose to purchase paid ssl, which means you can submit the work order for processing;
2. When you submit a work order in case of problems, the paid ssl will be answered by a specially assigned person.

 Corran wiring
Corran wiring · Clan Kelan Communication is a global supplier focusing on generic cabling. With more than 10 years of industry experience, it focuses on generic cabling products: copper cables, cables, distribution frames, cabinets, etc

Webmaster Tools There are free ones, which are also OK Alibaba Cloud Find a paid one

Didn't pay for it

 SEO training enrollment
one hundred and ninety-one