Udemy

Udemy is built for people who want to buy or sell online courses without going through a university or a formal training provider. By our assessment, its best feature is the sheer range of topics and the low-friction format: short video lessons, downloadable resources, and a marketplace that makes it easy to jump between skills. The catch is quality control, since the catalogue is open enough that course depth and teaching style vary a lot from one instructor to the next. In practice it feels less like a single school and more like a giant shelf of self-paced lessons, which is useful when you want a quick answer or a practical skill. It sits closer to a marketplace than a curated classroom, and that is exactly its ceiling.