Each domain name comes with DNS data or DNS records, to make sure that all web and mail traffic is sent to the correct servers. The two most important records we need for setting up our domain are A records and CNAME records. Let's make sure you understand these two.
An A record refers hostnames to IP addresses. This way, your domain name refers to your hosting account on servers. For example: www.sitemanager.io uses an A record to refer to IP address 184.108.40.206
You can also use wild cards, to make sure that combinations with that specific wildcard redirect to your IP address.
*.sitemanager.io uses an A record to refer to 220.127.116.11
But it also means that www.sitemanager.io refers to that specific IP address. Separate A or CNAME records exceed the wildcards.
The best practice for setting up you domain with SiteManager is adding an A record for the root of your domain, go ahead and don't worry about TTL for now.
This record makes hostnames refer to other hostnames. The result is the same as an A record, except that there is no reference to an IP address, only to a different host name. Go ahead and don't worry about TTL for now.
Take in mind it can take some time before any DNS changes take effect. For an A-record or CNAME it could easily take up to 4 hours. Always be careful with deleting already existing records, if you're not 100% sure contact your hosting support.