How to minimize the risk of loss in Stock Exchange?

There are many ideas, sometimes they reject each other. Below I present some of them:

- diversify the portfolio (don't invest only into one company, buy different tranches, etc.)

- avoid companies with dependence on commodity prices

- avoid companies near to the M&A transactions

- avoid opening gap (highest volatility)

- avoid "trade the news" (nonfarm payrolls or interest rate decision)

- change the time horizon of investment (daytrading, medium or long term investment)

- use benchmarking or technical analysis indicators

- use fundamental analysis rather than technical analysis

- select the proper transaction period ("Santa Claus rally" or just "sell in May and go away")

- don't invest your all savings (only this part which you can lose)

- create your own risk profile and strategy (emotions are not the best advisor)