According to JavaScript Best Practices, DRY, KISS, YAGNI, and HTML & CSS:

Here are some issues related to JavaScript best practices:

• The code has a mix of arrow functions and traditional functions. It is recommended to be consistent with the use of arrow functions throughout the code.
• Redundant code: The saveTodoItems() function is called twice in the addTodo() function.
• Unused imported module: The checkboxCheck module is imported but not used anywhere in the code
• Code repetition: The toggleDeleteIcon function is defined twice in the code, once as an imported module and once within the same file.
• Large functions: Some functions, such as displayTodoItems() and addTodo(), are quite large and could be refactored into smaller, more modular functions

Here are the issues related to HTML and CSS best practices:

• Lack of semantic HTML: The code uses div and li elements without any semantic meaning, which can make the code harder to understand and maintain

• would it be better to move local storage functions to the same module
• also try to use webpack file loader to add assets direct into HTML instead of adding using JS
• in displayTodoItems function you have to repeat the code when creating the dom element so, you can make a function to do that and call it when you want

According to JavaScript Best Practices, DRY, KISS, YAGNI, and HTML & CSS:

Here are some issues related to JavaScript best practices:

• Use of document to access the DOM: The code uses document to access the DOM, which is not efficient and can slow down the application. A better approach would be to use a variable to store the element and then access it when needed.
• Unclear variable names: Some of the variable names used in the code are unclear and don't follow best practices for naming conventions. For example, Add and Remove don't accurately describe what the functions do.
• Inefficient code: The code could be made more efficient in certain areas. For example, the Display function is called multiple times, even when there is no need to update the display specifically in ClearAll. function.

The HTML code seems well-structured and follows best practices. However, here are a few suggestions:

• Use semantic HTML tags to improve the readability and structure of the page. For example, use for the header, for the main content area,
  for the different sections, for navigation, for the footer,
• Add alt text to the element for better accessibility.

Thanks.