The website is an online interactive platform that offers free coding classes in six different programming languages like Python, PHP, jQuery, JavaScript, and Ruby, as well as markup languages including HTML and CSS. As of January 2014, the site had over 24 million users who had completed over 100 million exercises.
Furthermore, the site has received positive reviews from many blogs and websites, including the New York Times and TechCrunch. As Codecademy’s interactive portal enables individuals to take lessons and exercises right within the browser, individuals can pick up the basics very quickly, and because Codecademy is free, it provides a great learning.
Treehouse
Treehouse is the fastest and easiest way to learn to code, make apps, and start a business. The website is like more complex upgrade to Codecademy and would be the natural next step if individuals pass the Codecademy courses with flying colors. The website provides tutorials in CSS, HTML, Ruby, JavaScript, iOS and offers two subscription models—a basic $25/month one and a pro $49/month upgrade—but if you want to pre-test then there's a 14-day free trial, which you can avail from, without any obligation.  
Moreover, the website’s step-by-step guided approach is useful for individuals in tackling areas that they are not familiar with, and covers wide areas including HTML, CSS, WordPress, Ruby, PHP, Android, iOS, JavaScript and more.
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