Usually, when we need a website, we are looking for two thins:
domain
hosting
When we buy a hosting for our Website, usually we obtaion the needed information from the hosting provider - we get an IP address, etc.
This IP address you would put in the “content” as a value for your DNS records like A type yourdomain.com record being pointed to this IP address, then the A type www record, etc.
At least, the one for your main domain is needed, others are optional, or by far depending on the need and use for them.