SharePoint new experience pages are a great way to share ideas using images, documents, and web parts. You can create and publish pages quickly and easily, and they look great on any device. You can also make an existing page the home page for your site, even if you are using a SharePoint classic site.
If you haven't already created a page, you can do so using the steps in Add a page to a site. When you have a published page you want to use for your home page, do the following:
Go to the Pages library of your site. To do this:
On your site, click Pages in the left navigation. Or, if you don't see Pages, go to Settings at the top right, and then Site Contents. On the Site contents page, select Site pages.
From within the library, find the page you want to make a homepage, and then select it by clicking the circular option button to the left of the page title.
Click the vertical ellipses (...) next to the page title, and then click Make homepage.
Note: If you don't see the menu options described above, you may be viewing your pages library in the classic experience. To see these options, switch your document library to the new experience by clicking Exit classic experience on the left. More information on switching from and to the classic experience can be found in Switch the default experience for lists or document libraries from new or classic.