Certbot certificate issue error To fix these errors, please make sure that your domain name was entered correctly and the DNS A/AAAA record(s) for that domain contain(s) the right IP address

Being unfamiliar with

I tried to familiarize myself with it...
Only to find 35 "Always FREE" entries within their products.
So, I have even less of an idea before I started down that road.

Again, you need to understand the basic problem:
In order for LE to validate the cert via HTTP-01 challenge, it must be reachable via HTTP.
Even before that LE must be able to resolve the FQDN to an IP (or more).
That IP must reach the system in question via HTTP (TCP port 80).
If the IP keeps changing, how can the fixed IP now returned via DNS reach that moving IP target?
Which is also an equally big problem for anyone trying to reach your moving IP site.

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Maybe I've been shown a red herring and fell for it...?
Try showing:
ifconfig | grep -Ei 'add|inet' | grep -v fe80

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Here is the output

inet netmask broadcast
inet netmask broadcast
inet netmask
inet6 ::1 prefixlen 128 scopeid 0x10

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