Note: Some functionality is introduced gradually to organizations that have opted in to the First Release program. This means that you may not yet see this feature or it may look different than what is described in the help articles.
Overview of sites and subsites
A site is a group of related web pages and apps where your team can work on projects and share information. When you create a SharePoint site or subsite, you can choose from several site templates to build a site quickly. Multiple subsites relating to a particular project, team, group, or location can be organized together under a single site.
SharePoint Sites are grouped together into a site collection, also know as the top-level or root site. When you create a site, you are creating it within a site collection. The site collection requires site collection administrator permissions to manage.
Wherever you are in the site hierarchy, a higher level site is called a parent site, while a lower level site is called a subsite, or child site.
Whether you are permitted to create sites and pages depends on how your organization has configured the permissions for the site. If you don't have permission to create a site, you'll see a message that says, "You are not allowed to create team sites at <name of your top-level site>." Contact your administrator for proper permissions.
Should I create a site or a subsite?
Create a new site from the Sites page if you have permission to do so, and if you don't want the site to inherit the appearance, permissions, and navigation of the parent site. Create a subsite under a parent site if you want to organize your content that way, and if you want the site to inherit these settings from its parent site by default. (You can change the permission settings at any time after).
Steps to create a site
Sign in to Office 365. For help, see Where to sign in to Office 365.
In the top left corner of the page, select the app launcher icon and then select the SharePoint tile. If you don't see the SharePoint tile, click the Sites tile.
On the SharePoint page, click + Create site.
If your screen doesn't match the image above, click new or new site.
Give your site a name, and then click Create.
Your site will be created in the location your administrator has predefined and the site will appear among the sites you’re following. Your site will not inherit the permission settings or navigation of other sites. Now that your site is created, you can add documents and use the getting started tiles to share your site with others, change the look, add apps to the site, and more.
Steps to create a subsite
If you want to create a site to manage content related to an existing team or project, you can create a subsite off of that team or project site. For example, you could create a team blog as a subsite to your team site.
Before creating a subsite, make sure you are at the location on your site where you want to create the new subsite. To create a subsite you need to have at least permission equivalent to being in the Designers group on that site. When you create a subsite, you can choose from several site templates, such as a blog, community site, or project site.
Go to the site where you want to create your subsite.
Click Settings > Site contents.
On the Site Contents page, click + New at the top of the page. If you don't see + New, click new subsite.
Type a Title and URL name for the site, and select a template. If you want to, you can also change the permissions and navigation settings for the site on this page.
For more information on templates, see Using templates to create different kinds of SharePoint sites.
Now that you've created a site, learn how you can customize and get the most out of it: