Remove excerpt & Content on Posts

I’m trying to remove the excerpt from my posts. I do not want the content to show. All I want to show is the title, the date & the read more.
I know this question was already asked here: How to show content without excerpt?
but I couldn’t quite get it to work. I went into the wp-includes/post-template.php file and set the $stripteaser to “true” but nothing would happen.
On a different page I read something about setting the “excerpt” to “0” but where exactly do I need to do these changes?

(I’m already working in a Child Theme)

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