When discussing whether a new domain or subdomain would be better for you, it is important that we all understand what is being discussed. A new domain a distinctly different website, while a subdomain is directory on a main domain that operates independently of the main domain.

Technically, the www in www.yoursite.com is a subdomain, as is the first part of yoursite.co.uk, but we are not discussing such technicalities here. From now on we will be referring to a subdomain in the form of a directory on your root website that acts as a separate website with all its own admin and content files.

For example, you can create a WordPress subdomain site2.MySite.com by creating a ‘site2’ folder in your MySite.com website root directory and installing WordPress into that folder with the site2 name. To name it simply site2.com, you would have to pay for the site2 domain name.

Here are three example URLs for the options available to you:
www.yoursite.com
example.yoursite.com
www.yoursite.com/example
You can read more here https://universalinformative.org/new-domain-or-subdomain-pros-and-cons-of-subdomains/?preview=true&frame-nonce=4ae5ccafab