Every web developer needs to validate their codes according to standard formats especially ReactJS Web Developers. When writing JavaScript with an editor such as Visual Studio Code, there are different ways you can ensure your code is syntactically correct and in line with current best practices. You can use a linter to do this. Linters check your code for syntax errors and highlight errors to make sure you can quickly find and fix them.

As a front end website developer we have to fulfill what user want in template design such as how to display menu in Sidebar for website which we will be developed. To simplify you in developing sidebar menu for your website, I have got a references from URL article below. https://bootstrapious.com/tutorial/sidebar/index.html

CSS is the language for defining how the HTML Document is presented. Presenting HTML document to a user means turning it into a form that is usable for our readers. Browsers, such as Firefox, Chrome or Internet Explorer, are designed to present HTML documents visually.