Investing is all about right mindset once you develop that everything falls into right places.
The key rules are beautifully summarized by Benjamin Graham through the analogy of Mr. Market.
According to that, you are partner in a business with a crazy person Mr. Market.
Mr. Market has wild mood swings.
Every day he offers you to Buy your shares at a particular price or Sell his shares at a particular price.But leaves the decision up to you entirely.