Udemy is the official application of the platform known under the same name, where you can learn about various topics using your tablet or smartphone. A part of the content is free and the other part is made by paid content. The main requirement is to create an account, this step being easy to complete just by inserting the relevant information.
Its database contains over 80.000 video courses created by instructors with experience is that specific domain. For example, you can use this app to learn about computer programming and coding, web development, finance, cyber security, marketing, design, fitness and health, photography, etc. It basically covers about 2.000 different topics and it has support for 50+ different languages. If you're looking for a specific lesson, you can either browse through multiple categories, or you can save time by taking advantage of the incoporated search function.
Just type the proper keyword/s and wait for the application to retrieve relevant results. Another positive aspect of Udemy is the ability to download content which can later be enjoyed without having an active Internet connection. Moreover, you can listen to your lessons in the audio mode if you prefer this way.