Udemy

Udemy is an online platform that lets people design and sell courses. Most courses on Udemy are free, but some are paid, and paid courses typically cost anywhere from $5 to $250. The site also offers a "Course of the Week," which features a particular paid course at a discount. Browse the extensive list of offerings - in subjects such as technology, business, design, math and science, arts, music, languages, and education - here.