How to add SSL certs for multiple domains?

Hi, I have multisite working with five domains. I want to add SSL certs for all domains, with one bot and one cert for all of them individually. I do have experience in the IT industry, just new to multisite. Where can I find some instructions to help me with this?

Hey there!
Check the information in this link

You need to purchase and install a multi-domain SSL cert to your all different domains. Check out the below link:-
https://certera.com/ssl-types/multi-domain-ssl-certificates

You should get a Multi-Domain (SAN) SSL certificate that covers all five of your domains. Once you have the certificate, you can install it across your multisite network. click on this link - Multi-Domain Wildcard SSL Certificate at $14.99 – SAN Wildcard SSL