How to create a new site in SharePoint
Go to Active sites in the SharePoint admin center, and sign in with an account that has admin permissions for your organization.
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Select Create.
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Select Team site (to create a Microsoft 365 group-connected team site), Communication site, or Other options to create a new team site without a Microsoft 365 Group.
Follow the steps to specify a site name, owners, members, language, and other settings. When you're done, select Finish.
Note:
If you enter a site name and another site already exists at the default address for that name, the site address will automatically be changed to an available address. For example, if you enter "Marketing" as the site name, and you already have a site at /sites/marketing, you will receive a warning This site address is available with modification and will be offered a new URL automatically at /sites/marketing2. If you want to re-use the URL "marketing" for the new site, you need to permanently delete the existing site or delete the redirect at that address.