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(https://medium.com/@saurabh6790/generate-wildcard-ssl-certificate-using-lets-encrypt-certbot-273e432794d7)
Start at Step 3. Replace `./certbot-auto` with `sudo certbot`
Use this to run command to create
Note: There can be multiple domains in command, e.g. `-d yueteng.me -d *.yueteng.me`
Note: (The order is important) First deploy DNS TXT record under the prompted domain, pause for 5 minutes for it to activate, use the website below to verify it’s been activated (mind the value must be correct) then hit continue (otherwise will fail)
Note: If you include multiple domains, you will be required to enter multiple DNS TXT records
[DNS Lookup Text Record - MxToolbox](https://mxtoolbox.com/TXTLookup.aspx)

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