Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Khan Academy - Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
Encyclopædia Britannica - Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.
Coursera - Build skills with courses, certificates, and degrees online from world-class universities and companies
Investopedia - Investopedia has a lot of information to share with business mind people.
edX - Best Courses. Top Institutions. Learn anytime, anywhere.