Udemy has hundreds of categories for learning about all kinds of subjects: from web design and photography to data analysis, personal development, and yoga. You can also find language courses. You can even join courses to learn how to uses certain programs and applications.
Udemy members can even download courses to watch even without an Internet connection. This way, you can take advantage of the time you have when traveling or even during your morning commute, since you won't need to be online to keep learning. Plus you can listen to the courses in 'audio only' mode if you prefer.
Udemy is an excellent tool for learning, thanks to which you can take thousands and thousands of courses on tons of different subjects. Now all you need is the time to do it.
Requires Android 4.1 or higher.