When it comes to investing, my suggestion is to first understand your strengths and weaknesses, and then devise a simple strategy so that you can sleep at night!
Basically, we try to buy value expressed in the differential between its price and what we think its worth.
We get a feeling, if we can, about what we think the company is worth.
You have to invest the way that's comfortable for you.
Fear and greed tend to affect one's judgement.
Earnings can change dramatically. Usually assets change slowly.