Coursera provides courses on many aspects of business and entrepreneurship from different universities. They can help you learn different skills or prepare to take a career path in a certain subject.
NFTE has several webcasts on different topics from planning for startups to managing stress and anxiety.
Utah Curriculum Resources has many lessons on topics from accounting to business applications. Each lesson provides worksheets to learn the material and links to other activities and quizzes
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The Blue Ocean Competition is an entrepreneurship competition where teams pitch their business concepts and compete for cash prizes.
The Conrad Challenge is a competitions where teams of students age 13 - 18 identify and create solutions to important issues in the world of different categories.