@Grayches, Have you had a chance to read the docs?
And also maybe The art of asking great questions? Your answer is short of information as @Karmalakas has pointed out…
While reading the docs, pay special attention to:
- Headers / Frontmatter | Grav Documentation, which will list all existing header values for a page.
page.descriptionis not one of them… - Headers / Frontmatter | Grav Documentation, about how you can define your own custom frontmatter like ‘description’.
- Themes | Grav Documentation, where you will get a primer on Twig
- The API of Page