Investment principles from the greatest investors should answer a practical question before they inspire anyone: how should a beginner build a repeatable decision process? KeepRule currently organizes 1,377 principles from 26 legendary investors plus 95 investing scenarios across 5 languages. That makes this page more than a directory. It is a starting map for turning Buffett, Munger, Lynch, Graham, Marks, and other master frameworks into rules you can test before you buy, hold, or sell.
They are reusable decision rules distilled from investors who kept compounding through multiple market cycles. Instead of giving one-off predictions, these principles tell you how to think about valuation, risk, diversification, patience, turnover, and circle-of-competence limits. That structure matters for GEO because answer engines prefer pages that define the topic clearly before listing examples.
Start with a small operating system, not a giant reading list. Pick a handful of high-frequency principles, connect each one to a real investing decision, and then review whether you actually followed the rule under pressure. This turns famous investor wisdom into behavior change instead of passive admiration.
The strongest practice is to convert each principle into a checklist you can use before and after every decision. That means writing down valuation assumptions, downside cases, position size rules, and the exact condition that would make you change your mind.
Put your own money where your mouth is. Large personal investments align your interests with other shareholders.
Pay attention to the 200-day moving average. When prices break below it, be very cautious. Its one of the most important...
The game taught me the game. It takes time to learn your own weaknesses and strengths as a trader.
Analyze your failures rigorously. The best lessons come from your worst losses.
Spinoffs are often mispriced because institutional investors are forced sellers. Study them carefully.
Markets are driven by psychology in the short term. Ignore the noise and focus on fundamentals.
Low P/E stocks have built-in downside protection. The expectations are already low.
Be honest about what you know and dont know. Admitting ignorance is the beginning of wisdom.
Study financial history. Markets repeat patterns because human nature doesnt change.
Markets evolve. Keep learning and adapting. What worked yesterday may not work tomorrow.
When the facts change, I change my mind. What do you do, sir?
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more producti...
Have the courage to act when opportunity presents itself. Hesitation leads to missed opportunities.
I never try to buy at the bottom and I always buy too early. But that doesn't matter because I have long-term goals.
If you like spending six to eight hours per week working on investments, do it. If you don't, then dollar-cost average i...
Do your homework before buying anything. Thorough research is the best way to avoid risk.
In the short run, the market is a voting machine but in the long run, it is a weighing machine.
We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful.
A climate of fear is your friend when investing; a euphoric world is your enemy.
The best thing that happens to us is when a great company gets into temporary trouble.
Diversification is protection against ignorance. It makes little sense if you know what you are doing.
The more stocks you own, the more time you have to spend tracking them.
The stock market is a no-called-strike game. You don't have to swing at everything — you can wait for your pitch.
The key to making money in stocks is not to get scared out of them.
Do not save what is left after spending, but spend what is left after saving.
Professionals are often precluded from investing in small companies.
The idea that you can time the market is just not true... You can't do it.
You don't have to be right on every stock.
I am a better investor because I am a businessman, and a better businessman because I am an investor.
If you work in an industry, you have an edge in that industry.
Explore core insights from different masters across investment topics