Understanding DNS Record Types

"Blank Name - A record that has nothing in the name slot gets used for all requests made to the base/naked form of the domain."

No, a blank name uses whatever name was used on the previous record. Near the top of the zone file, that name is usually the domain name because of the SOA record. But later on, it won't be.

I don't think this article is technically deep enough to be of any significant value ( at least for me ).

Not discussed at all ( and that people interested in the topic should know ) :

1. NS, SOA records

2. What exactly is TXT record.

3. What's the difference between CNAME, A Records

Later on I also checked the first article [1], which even doesn't explain what TLD is.

[1] https://pressable.com/blog/2014/12/04/dns-management-basics/

A question regarding TTL. If changing the TTL value of a record will speed up (for want of a better word) when that record is available to the DNS server, why would you ever set the TTL to 3600 or more? I understand that there is some kind of caching going on but I don't actually fully understand TTL and what is ideal.

Any advice/insights/explanations appreciated!

One thing I've been wondering for a while and haven't found a answer to.

Providers like Digital Ocean let you use their nameservers. Why would I do this over just using the registrars nameservers?