Udemy is a popular online platform for all kinds of courses. You'll find more than 130k courses and tutorials offered by other users over a range of topics. On Udemy you can learn almost anything, including but not limited to cooking, earth sciences, music theory, physics, guitar, foreign languages, and much more. In addition, you will find professional courses on several hot topics such as computer programming languages (i.e. Python and Java), project management, and leadership.

Each course is priced by the author. They're generally affordable, and some are even offered for free. All courses receive a peer rating, and you can even review student comments before enrolling to ensure it's the right fit.

Once you've purchased a course, you can follow it online or also download it to study on the go. Most courses are available from in video and audio format. The app also allows you to adjust the playback speed, add subtitles, and view a transcripts.