Amy Wang:

As crucial as a university degree has become for working in the modern economy, it is not the only route forward into a wildly lucrative and satisfying career—just ask famous dropouts Bill Gates, Oprah Winfrey, Michael Dell, Steve Jobs, Mark Zuckerberg.

In the future, a single bachelor’s degree in a particular subject will no longer suffice for many of us anyway. As robots and automation sweep the global workforce, hundreds of millions of people—the majority of whom do not have the time or money to go pick up a brand-new four-year degree—will have to “re-skill” in order to land new jobs. The question that employees and employers alike face is how to get that done quickly, efficiently, and, most importantly to many, cheaply.

The internet, luckily, is already a booming resource. Whether you find yourself seeking new employment mid-career, curious about alternatives to a college education, or simply are interested in learning for learning’s sake, Quartz At Work has compiled some of the most dependable, high-quality materials you can access to learn anything on the internet.