Gather markdown information from an other page

Is it possible to gather information from a other page?

For example I have a page with a template set to default.html.twig and I have an other page with a template set to home.html.twig. I want to use the markdown information from the pages with a template set to default.html.twig in the pages with a template set to home.html.twig.

I am not sure I understand... are you wanting to display the content (Markdown) from one Grav page within another or something else?

Maybe you want to look at the Page Inject plugin: https://github.com/getgrav/grav-plugin-page-inject