Template files are part of a WordPress theme, along with other types of files like stylesheets, scripts, and images. You cant install template files individually. They work together with the rest of the files in a WordPress theme to change your website design. A template file only controls one page or part of a page.

How do I create a WordPress template?

Go to WordPress Admin Panel > Pages > Add New. You can see the new custom page template listed on the right side. Create a new page and set its template to PageWithoutSidebar. Once done, Publish it.