Udemy

With an average of 800 new courses added to their repertoire every month, Udemy is a bit more expensive than its competitors. Costs vary broadly, ranging from $10 to $500 for different courses; the most popular Udemy courses in business and technology tend to be upwards of $100. However, you can read the reviews of former students before signing up to any of the courses, so you can make a more informed decision.