eLearning, or electronic learning, is the delivery of learning and training through digital resources. Although eLearning is based on formalized learning, it is provided through electronic devices such as computers, tablets, and even cellular phones that are connected to the internet.
Khan Academy. Khan Academy doesn't get top billing due to its popularity.

Coursera.
W3 Schools.
TedEd.
Codecademy.
Open Culture.
Open Yale Courses.
Academic Earth.

https://elearningindustry.com/8-inspiring-elearning-websites-offer-students-inspiring-educational-alternatives