How to earn money in stock market

This is my own opinion, follow at your own risk.

There are several ways to earn money in stock market in my opinion:

1. If you have a good knowledge about a company and its management that is the best way to put in your bets accordingly.

• Other way of being a winner gambler in stock market, is to take a particular stock only. The following example will make it easy to understand the strategy.         

         Let's say you buy 100 stock of good comp any paying dividents ( I call it a kind of insurance as the company is willing to share its benefits and is running in profit at this time. Say you bought the stock at 50 dollars. Let's say stock of that so called insured company fell to 45, buy 200 shares. Let's say the stock still fell to $40 buy 400 shares and so on. This way you keep the average cost of stock to close to the value that the current value of stock is. But as soon as the stock prices increase by $ 5 every time start selling the stock, in the same increments that you bought  them. This assumes that you have good capacity to invest and good appetite to hold the losses. This works most of the time but fails in some cases like company failing due to some frauds or some other unforseen reason.
The above strategy can also be done in day trading.

What is your way to invest? Any bright ideas? Dare to share?