I think this is the most important which most people forget. When the price goes down even for just a little, they lose their minds and get worried of the money they're going to loss before even thinking about how the market works and how it is globally affected. People must first research and assess the market before making an investment, otherwise if they don't know see the global view of the market, then they won't understand why the price frequently fluctuates and is affected by global factors.