EdX is a global nonprofit and online learning platform founded by Harvard University and the Massachusetts Institute of Technology. It partners with universities and companies around the world to ...

Codecademy offers a host of basic courses for free, and a whole lot more with a Pro account for $19.99 a month. You can find classes in tech-focused subjects like web development, data science, ...

Udemy is an incredibly large online learning platform where you can learn just about anything at all. There are over 150,000 courses currently on the platform on a wide range of topics and fields.