How do I get red of the comment box?

The easiest way is by using a plugin like https://www.ads-software.com/extend/plugins/disable-comments/

It works, thanks!

Would you also happen to know how I get rid of the text above and below my posts giving information on the postdate and category? By the way, this information is somehow only added in posts on my ‘home’ page.

Greetz Marc

You will need to edit your theme. Try creating a child theme with your changes https://codex.www.ads-software.com/Child_Themes

Ok. Could you explain to me what steps I need to take?

It’s explained within the Child Theme resource, linked by Tomontoast.

Ok, I’m gonna work on it, thanks.