The best way to structure your HTML website folder depends on the size and complexity of your site. Here is a common folder structure that works well for most small to medium-sized websites:

- index.html
- css/
  - style.css
- js/
  - script.js
- img/
  - image.jpg

In this structure, you have the main index.html file at the root of the folder, along with three subfolders: `css`,`js`, and `img`.

The css folder contains your site's stylesheets, which should be named style.css by convention. You can also create additional CSS files for different parts of your site, such as a separate file for print styles.

The `js` folder contains any JavaScript files that your site requires, such as scripts for form validation, interactive features, or third-party libraries.

The `img` folder contains all the images used on your site. You should organize images into subfolders within the `img` folder based on their purpose or location on the site.

If your site is larger or more complex, you may want to create additional folders for different sections of the site, such as a folder for blog posts, a folder for product pages, or a folder for user profiles. In that case, you may want to create a more hierarchical folder structure to keep things organized and easy to find.

Regardless of the size of your site, it's important to keep your folder structure organized and consistent. This makes it easier for you to manage your site's files, and for other developers to understand your code and make updates in the future.