Getting a wide ranging education in personal finance, corporate finance, taxation, economics and investment theories will help. However, finding areas of the world or business in which you can become relatively expert can help in the process of finding investments.
The reality is that in the modern world - especially with the power of the internet - there is very little information that is not in the public domain somewhere. However, the world now has information overload. Whilst the information might be available, few people now have the time to find or understand it. The people who know these things and can 'join the dots' have regular opportunities for stock market investment.
Once the basics have been covered and understood, it may be that just one or two hours of reading each week will be enough to keep knowledge up to date. But keeping up to date is vital.
