There are two options in SharePoint Online for templates.
- Use a Pre-built SharePoint template
- Build your own custom template
To get started go to your SharePoint homepage and from the on the upper left select New>Page from the menu. 
Create from a pre-built SharePoint Template
From the choices in the dialog under "Page Templates", choose Blank or any of the other existing templates. 
Click Create Page to begin using your new template.
Create your own template
If you have a page that has been created and would like to make it a template, follow these steps:
- Click the site's gear icon for Settings in the upper right of the screen.
- Select Site Contents from the menu dialog
- Select Site Pages from list.
- Click the page that you would like to make a template
- In the Page options, choose Promote

- Select Save Page as Template from the menu

Starting from Scratch
To start a template from scratch, follow the directions to use a pre-built template and select Blank.
- Build the page out with images and webparts, using page layouts and color options that you like.
- When you go to Publish the page, choose from the Promote Options menu to Save Page as Template.

- Done.
Using your newly created template
Now that you have created a template of your own, you can choose to apply the template to a new page from the Page Templates dialog.
- Choose Saved on the Site

You might also want to find the templates folder in your site's contents. To do this,
- click the site's gear icon for Settings in the upper right of the screen.
- Select Site Contents from the menu dialog
- Select Site Pages from list. Inside the Site Pages directory, you will see a new folder called "Templates"

Need help?
If you have questions, please contact the ITS Help Desk at 608.342.1400 or helpdesk@uwplatt.edu. You may also visit the Help Desk on the first floor of the Karrmann Library.