Add section for subdomain records

Author: RebeccaTamachiro

src/content/docs/dns/manage-dns-records/how-to/initial-setup.mdx

@@ -1,5 +1,5 @@
 ---
-pcx_content_type: how-to
+pcx_content_type: concept
 title: Initial setup (TBD)
 sidebar:
   order: 1
@@ -67,5 +67,12 @@ When you create a record on the zone apex, you are indicating to Cloudflare wher
 
 Usually, the zone apex record makes your domain accessible by visitors. In this case, the necessary record type ([A, AAAA, or CNAME](/dns/manage-dns-records/reference/dns-record-types/#ip-address-resolution)) and its content will depend on the provider that [hosts](/fundamentals/setup/manage-domains/#host-your-domain) your website or application.
 
-If you are using Cloudflare Pages, refer to [Custom domains](/pages/configuration/custom-domains/). If you are using other providers, look for their guidance on how to connect domains managed on external DNS services. Make sure you have the records required by your hosting provider on your [DNS records table](/dns/manage-dns-records/#dns-records-table) at Cloudflare.
+If you are using Cloudflare Pages, refer to [Custom domains](/pages/configuration/custom-domains/).
 
+If you are using other providers, look for their guidance on how to connect domains managed on external DNS services. Then, make sure you have the records required by your hosting provider on your [DNS records table](/dns/manage-dns-records/#dns-records-table) at Cloudflare.
+
+## Subdomain records
+
+Most subdomains serve a specific purpose within the overall context of your website. For example, `blog.example.com` might be your blog, `support.example.com` could be your customer help portal, and `store.example.com` would be your e-commerce site.
+
+Even if you do not require specific subdomains, you might want to set up at least the `www` subdomain. It will usually point to the same content as what you have on the apex domain (`example.com`) or use a [redirect](/fundamentals/setup/manage-domains/manage-subdomains/#redirect-a-subdomain-to-the-apex-domain). Having a DNS record on the `www` subdomain helps guarantee that a visitor who types `www.` in front of your domain address on their browser can still find your website or application.