So let's explain each of the setting of the DNS!
As some people say, the dns settings are like going to the post office. The DNS records sorts out where everything must be delivered. Or in another words, what post office box it needs to be delivered too.
The name servers also known as NS RECORDS are the primary records that make up a IP ADDRESS. Meaning that this record converts the IP ADDRESS 0.0.0.0 to the name of the web site. If it was not for this record users would need to type in the ip address instead of typing in the web site address. So instead of telling a customer visit us at autowebdesign.us we would have to tell them to visit us at 18.104.22.168. Not very user friendly.
This is the address records. Address records point domains to their selected ip address located on a server.
You might hear the term Canonical Name Record, but within your dns setting it will be listed as CNAME. The CNAME points domains with subfolder to other folders under the main domain name. So for example if you wanted your site to default from http:yourdomain.com to subfolder like example. Then you would set the CNAME to resolve to https://example.yourdomain.com
The MX RECORDS is also known as your mail exchange records. This setting directs your email for your domain. These record work with your A records and NS records. So you might ask, shouldn't the records all ways be with the domain? Not always. You can host your email at another server than your web site.
This is known as pointer and is used to resolve IP address to a domain. This means your web site will point to a ip address and vice versa. If checked this would tell you that it belongs to your domain name. This also works with your emails. The receiver of your emails checks for possible spoof emails which will be treated as spam.
Text records are custom records that contain human readable data. Text records are used to verify domain ownership for services like yahoo or google.
Service records also known as SRV records are used to point one domain to another domain name using a specific destination port. These would be used to VIOP or IM services to be directed to a separate location.
This record will point the domain or sub domain to a an IPv6 address in the same way that an A record does.
NOTE: A Records use IPv4 address only. Most hosting companies do not yet support IPv6 address.