You can create group-connected SharePoint team sites in seconds. When you create a group, Office 365 gives the group a shared inbox, a calendar, a OneNote notebook, a default place for files (the team site document library), Planner for task management—and now a modern team site with pages, lists, libraries and team news – all to help the group collaborate, communicate and move things forward.

Create your team site in seconds, give it a name, establish the connected Office 365 group, site classification and preferred language.
Create SharePoint team sites connected to Office 365 Groups by clicking the Create site button on the SharePoint home page in Office 365. A two-step creation wizard will fly out from the right.
Step one: Enter the title of the team site, select whether the group will be public or private, choose the site classification & preferred language, and then click Next.
Step two: Enter the owners and members, click Finish and you’re done. A modern SharePoint team site is provisioned and ready for use in seconds, along with all the other group apps to improve teamwork all up.
Learn more about creating a SharePoint team site in Office 365.