JavaScript, CSS, HTML, HTML5, MySQL, WordPress, PHP and Python are the most in-demand tech skills from employers in 2020, according to a Upwork report.

Use this handy, simplified guide to quickly learn HTML and CSS -- a foundation of modern web development.

Here's an easy-to-follow web developer roadmap that will guide you through the world of HTML, CSS and JavaScript based technologies.

jQuery UI is another option for building HTML and JavaScript-based application interfaces. It's completely open source and has the advantage of being directly compatible with jQuery, jQuery Mobile, ...