In the stock investment, what is the crucial thing? value investment? market timing? chart analysis?....
This answer will be found out the name of the head of the hedge fund. The head of hedge fund is called Portfolio Manager(PM). As it pointed out, the crucial thing in the stock investment is a "portfolio".
To sum up, the important thing is diversification of assets, including stock, bond, gold, dollar, etc.
Basically, if we believe that the price of the top 10 of the world class companies will going up gradually, the next challenge is to fluctuation which some recession may bring to us. In this regard, the balance among various assets will be essential.
The Problem will be the magic ratio among assets, depending on the economic circumstances. That will be what we should find out and solve by continuous learning.