A Question Regarding Zipfiles

Hello, I just finished personalizing the “Counter” app under “Making Websites Interactive.” In the video, “Personalize and Download your App”, Treasure was saying that when you download your zipfile to your computer and unzip it, that it’s important to delete certain files (which I have not been doing) such as package.json and config.js (mine says vite.config.js) before uploading to Github or Netlify. I’m quite the newbie, so I am assuming that also includes the Readme file? I’m also wondering why then are those files there if we don’t need them? I’m curious. I like to know what I am dealing with and I am always afraid to delete files if I don’t know what they are for. Thank you.