By default, comments are turned on for both static pages and blog posts. This tutorial explains how you can turn off comments for single posts and pages as well as turning comments off completely.

Deactivate comments for a single page or post

You can simply turn off comments for a single page or post in your WordPress backend. Therefore please go to Pages → All Pages and hover over the page which should have no comments. There will appear some links undearneath the page title where you can click on Quick Edit