From the book Warren Buffett's Ground Rules: Words of Wisdom from the Partnership Letters of the World's Greatest Investor.

In this book you will learn the basic rules that Warren Buffet has followed to be successful in the stock market, Warren Buffet is a person who throughout his life following these rules has managed to build great wealth that has made him the fourth richest man in the world.

1 be patient
Wealth is more likely to be created with careful investment than with frantic speculation, investing is not aerospace engineering, it is not a complex, abstract science difficult or almost impossible to understand, however most investors make the simplest but very serious mistake they confuse speculation with investment, speculators obsessively follow the ups and downs of the market, to buy and sell stocks in hopes of getting rich quickly, investors on the other hand buy businesses based on careful assessment of their present and future value, An investor when buying a stock is buying a fraction of a business, the price of that stock can change over time to reflect how the business is doing, if the profits are good the value of the business increases and the price of the shares also increases , but if the business loses value the share price falls, sometimes the share price does not reflect c With precision the value of a company investors who buy stocks and undervalued companies and then wait patiently for the market to correct cannot avoid making money and that patience is rewarded with a compound interest that is the key factor of long-term investments term, compound interest is the process of continually reinvesting profits so that each new penny begins to have its own returns, Einstein himself called compound interest the eighth wonder of the world and noted that people who understand it earn it and people who don't understand pay for it.
 One of Buffet's favorite stories illustrating the power of compound interest is that of the French government's purchase of the mona lisa, King Francis I paid the equivalent of $ 20,000 for the painting in 1540 if he had invested the money at a 6% compound interest rate would have almost had a billion in 1964 so if you want to be a successful investor then don't speculate invest.

2 MEASURES
All successful investors have one thing in common they compulsively measure, many know the stress of checking their bank balance or getting on the scale after a weekend of excesses for most the anxiety and frustration of seeing the numbers and realizing that They have failed is too much, that is why most prefer to silence the rooster trying to avoid the dawn, that is, they ignore the numbers trying to avoid the harsh reality if you want to be a successful investor then you have to overcome this and have the necessary courage to tell the truth , good or bad, telling you the truth, as an investor is vital, what is not measured cannot be improved.
 A CAREFUL MEASUREMENT A CLEAR ANALYSIS AND A FIRM HAND even if you are depressed are the only ways to be successful as an investor, sticking your head under the ground will not make you a successful investor, KNOWING WHAT TO MEASURE AND THEN DOING IT RIGHT IS THE ONLY WAY to know if you are on the right track so how can you compulsively measure ?, by monitoring your investments every day by tracking their performance in relation to previous performance and being patient when your actions are down and hence the secret of the victory ENERGY NEEDS COMMITMENT AND HONESTY TO KNOW WHEN TO MAINTAIN THEM AND WHEN TO SELL THEM

Buffett advises those who don't have the time or energy to spend on their investments INVESTING IN INDEXED FUNDS

3 BE COHERENT

If you are a rancher then do not try to get rich with computers DEVELOP YOUR PERSONAL STYLE AS AN INVESTOR, each investor is unique if you want to be a successful investor so your investment style should reflect your personality, objectives, available money and especially your skills, it is tell your knowledge and your experience
YOU MUST NOT INVEST ON THE BASIS OF HOW MUCH YOU HAVE, BUT ON THE BASIS OF HOW MUCH YOU KNOW, a 20-year-old investor is not the same as a 50-year-old investor, both have a different risk profile, which can be a very good investment for some insurance companies which is not for the other. Because they are different people at different times in their lives, if you know a lot about cattle, investing in cows can be a fantastic investment for you, because you understand the risks, you know how to distinguish good from bad cattle, you know when to buy and when to sell, how much to buy , who to buy where to buy, where to sell and how to sell, but that same investment can be very bad for someone who has no idea of ​​cattle.
 Hence the importance of investing in what you understand, -WHAT YOU KNOW AND WHAT YOU HAVE EXPERIENCE- there is also good news IF YOU ARE A NEW INVESTOR WITH LITTLE MONEY you have an advantage over investors who manage large funds you can invest in small companies that are not listed or having large percentage gains when Warren Buffett started his fund in 1956 he had just over $ 100,000 to invest, by 1980 his fund had skyrocketed to $ 1.9 million. He attributed this incredible rate of return to his focus on small and relatively unimpressive investments, the key message here is to be consistent and focus on those opportunities that you can take advantage of.