What qualities do people look at web developers when they hire them to build a Web site. How to be become an expert web devloper????

Below are some step explain that how web development architectures in real is:- Operating system (Linux, etc.) Server side programming language (PHP, Python etc.) web server Front-end UI stack (Bootstrap, CSS3 SAAS/LESS, HTML5 , jQuery, angularJS or similar JS libraries etc.) Database engine (Mysql, sqlite, MongoDB etc.) Caching management (Media caching - CDN server, Backend caching - APC for PHP, web server caching - redis etc.) Web Frameworks (MVC frameworks such as Zend, laravel for PHP)