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

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

This online course gives an introduction to jQuery (a JavaScript library).

This course teaches how to style websites with CSS.

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 upper extremity anatomy. In addition to the free video lessons, further (paid) trainings are available.

This online course teaches how to build powerful interactive applications with this popular JavaScript library. React is an open source library developed by Facebook.

This course teaches how to program in Ruby, a flexible language used to create many websites.

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

Khan Academy provides various free introductory macroeconomics video lessons. Topics include national income and the GDP, inflation, demand and supply, business cycles, the...

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

This course provides a selection of individual lessons and analyses from experts on the 2020 corona virus outbreak. It includes topics such as an epidemic overview, fatality...

Khan Academy provides various free introductory chemistry video lessons. Topics include atoms and compounds, chemical reactions, the periodic table, chemical bonds,...

This course teaches how to program in C++, which is a language well-respected for its flexibility and low-level functionality. It is used in the development of operating...

This online course teaches how to create websites by structuring the pages with HTML.The course is designed for beginners and includes HTML elements and structures as well as...

This course teaches how to build web apps using AngularJS 1.x, enabling learners to use AngularJS to create their own apps.

This course teaches how to program in Go (Golang), an open-source programming language supported by Google.

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

This online course introduces learners to the Flutter framework with interactive lessons on basic app components.

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