Hi @karam084 👋

Great work so far but there are spaces to improve

• You did a great job on the LUXOR time, it is running
• You may want to add your name to the copyright
• the .vscode you can add to the .gitignore file
• You might want to add an image of your application to the README.md

In the Books module, you declared your methods using a #…the s could be led to syntax error and misunderstanding of your code. I think you can do without them.

Inside index.html kindly remove lines 73-80 in the index.html

    <script src="./modules/data.js" type="module"></script>
    <script src="./modules/book.js" type="module"></script>
    <script src="./modules/addBooksListener.js" type="module"></script>
    <script src="./modules/addNavListeners.js" type="module"></script>
    <script src="./modules/checkAndDisplayList.js" type="module"></script>
    <script src="./modules/displayAllBooksListener.js" type="module"></script>
    <script src="./modules/domElements.js" type="module"></script>
    <script src="./luxon.js"></script>
    <script src="./index.js" type="module"></script>

Listening for Dom Loading could lead to overload in cases you have multiple listeners for your document. You can use Window.onLoad() to only run only when the DOM loads