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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,...

These short online courses provided by Skillshare cover various topics around web design / UX / UI, including the details of user experience and user interface, prototyping,...

This online course teaches React, the JavaScript library developed at Facebook for building user interfaces.

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

This online course gives an introduction to Kotlin, a popular programming language for Android development, web development, and more.

This online course teaches the JavaScript language, jQuery, the JavaScript framework and the ins-and-outs of adding interactivity in the browser.

In this online course, Aaron Sorkin teaches the art of film and TV screenwriting. The course includes more than 20 video lessons and various supplemental materials.

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

Comprehensive language course in Polish. The idea of this course is to learn the language "like a native". This means that the course creates an immersive learning experience...

This online course gives an introduction to Swift, a programming language developed by Apple for iOS and macOS.

This course teaches how to program in R, which is a popular language used by data scientists and researchers.

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

This online course shows how to use IBM's Personality Insights API and interact with Twitter; participants should be familiar with Python for this course.

In this online course, Shonda Rimes teaches the art of writing for television. The course includes more than 20 video lessons and various supplemental materials.

This online course gives an introduction to the programming language Ruby.

This online course teaches web development based on the Ruby on Rails framework.

These short online courses provided by Skillshare cover various topics around fine art, including drawing, illustration, sketching, painting, acrylic painting, and watercolor.

In this online course, Frank Gehry teaches his philosophy on architecture, design and art. The course includes more than 15 video lessons and various supplemental materials.

In this online course, Usher teaches the art of performing in front of an audience. The course includes ca. 15 video lessons and various supplemental materials.

In this online course, writer David Mamet teaches the art of dramatic writing. The course includes more than 20 video lessons and various supplemental materials.