By using bootstrap you can easily make dropdown menu or any other stuff. It's convenient and easy for people to build website. Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS- and (optionally) JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components. On top of that, it also provides support for JavaScript plugins.
Learn to use fontawesome to make your website more beautiful. It's easy to use and you can find all the icons you need. Google fontawesome cdn and you can find the link to use it. Cdnjs.com is a free and open-source CDN service trusted by over 11% of all websites, powered by Cloudflare. We make it faster and easier to load library files on your websites. CDN means content delivery network. It's a system of distributed servers that deliver webpages and other web content to a user based on the geographic locations of the user, the origin of the webpage and a content delivery server.