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Khan Academy provides various free introductory art history video lessons. Topics include prehistoric art, ancient mediterranean art (Egypt, Greece, Rome and others), medieval...

This online course teaches how to publish a personal website to the public Internet.

This online course gives an introduction to artificial intelligence and deep learning for programmers.

This course teaches how to add sign up, log in, and log out functionality to Rails apps, as well as how to manage access to specific pages.

This online course explores the fundamentals of JavaScript, the programming language of the Web.The course was designed for learners who have some knowledge of HTML and CSS and...

Khan Academy provides various free introductory mathematics video lessons. Topics include elementary math, algebra, geometry, calculus, trigonometry, differential equations,...

Free Polish language app with many short tests to learn "on the go". (Not a video course.)

These online lessons explain the basics of spine and back anatomy. In addition to the free video lessons, further (paid) trainings are available.

Khan Academy provides various free introductory physics video lessons. Topics include velocity and acceleration, forces and Newton's laws of motion, gravitation, energy,...

These online lessons explain the basics of lower extremity anatomy. In addition to the free video lessons, further (paid) trainings are available.

Khan Academy provides various free introductory video lessons on astronomy and cosmology. Topics include the scale of the universe, the Big Bang, stars, black holes, galaxies,...

This online language teaching method/app includes various languages, such as a German, English, Spanish, French, and Italian language course, and more.

Free Russian language app with many short tests to learn "on the go". (Not a video course.)

This online course introduces learners to the basics of Lua, a general-purpose programming language used for building games, web apps, and developer tools.

This online course gives a free introduction to digital currencies such as Bitcoin. It is also the first course of an online master's program in digital currencies from the...

Free Ukrainian language app with many short tests to learn "on the go". (Not a video course.)

These online lessons explain the basics of cross sections in anatomy. In addition to the free video lessons, further (paid) trainings are available.

Khan Academy provides various free introductory video lessons on health and medicine. Topics include human anatomy and physiology, circulatory system diseases, mental health,...

This course teaches the fundamentals of the Java programming language.It includes various interactive lessons and practical coding projects. (Also check out this overview of...

This online course includes various free introductory history video lessons. Topics include:The beginnings and the neolithic revolution; Ancient civilizations in...