Need a Plugin that Easily Puts Code for display in the Body of the site

I’m looking for a plugin that makes it so I can post HTML, etc, code on the homepage of the site without having to edit the php files because I don’t know how to do that. I downloaded a plugin that was able to put something at the start of the body right below the banner, so I assume there could be a plugin that does the same, but allows me to put HTML or other forms into it… and still have my posts follow below it.

I’d greatly appreciate it.