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!
Try to establish the value of a company.
Don't be in too much of a hurry to sell.
My first job at Graham-Newman was to prepare the annual report for that 10th year.
Be careful of leverage. It can go against you.
Sell is tough. It's the worst, it's the most difficult thing of all.