Leonardo dad Vinci is dubbed "the Renaissance Man" because he dabbled and succeeded in many different areas. Leonardo is most famous for his paintings, which captured shadow and depth unlike any other artist of his time
This is a bit of a generalization of course, but in general it would be a "new business" that requires the most drive and motivation, since there is often the most risk involved and need to think ahead.
Answer:
relying on credible sources to strengthen an argument
