To create an interactive list where you can mark items as done, you first need to know how to attach click events to each list item. This allows you to toggle a "done" state, usually represented by a CSS class. Follow these steps to build your interactive list:

1. Write your HTML with a list of items;
2. In your JavaScript, select all the list items using a method like querySelectorAll;
3. Loop through each list item and add a click event listener;
4. Inside the event listener, toggle a CSS class (such as done) on the clicked item;
5. Style the done class in your CSS to visually indicate completion, for example by adding a line-through.