I wrote an eBook to answer this exact question, title The Top 20 Reasons Startups Fail and How to Avoid Them. It is based on some research. You can download it free here: top20
I have also created a 3-part video course here reviewing this question from the perspective of what learning and tools are required to avoid these twenty mistakes called The Entrepreneur's Journey here.
How to Raise Millions for Any Company - Online Video Course
Bob Norton is a long-time Serial Entrepreneur and CEO with four exits that returned over $1 billion to investors. He has trained, coached and advised over 1,000 CEOs since 2002. And is Founder of The CEO Boot Camp™ and Entrepreneurship University™. Mr. Norton works with companies to triple their chances of success in launching new companies and products. And helps established companies scale faster using the six AirTight Management™ systems. And helps companies successfully raise capital.
Call (619) SCALE06 or email info@AirTightMgt.com for a complementary strategic consultation.