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!
Use book value as a starting point to try and establish the value of the enterprise.
You have to have patience in this field.
Basically, we try to buy value expressed in the differential between its price and what we think its worth.
My job was to find stocks that were undervalued.
Try to look for weaknesses in your thinking.