I want my image to only show up in the single post page, not on the blog page.

Images in posts show up not just on the single post page, but on the blog/home page too(where the recent posts are listed). I want them to only show up at the single post page.

I have a custom theme, and I was wondering what code snippet is required in order achieve this, or at least what part of the code should apply to these matters.
I’m new into this, so bear with me please ??