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A Margin of Safety: How to Thrive in the Age of Uncertainty
jamesclear.com
Once he has a net profit on a trade equal to 1% of his total equity, Brandt will take partial profits. Once a trade gets within 30% of his profit target, Brandt will employ much closer stop protection.
Jack D. Schwager • Unknown Market Wizards: The best traders you've never heard of

Margin of safety—you can also call it room for error or redundancy—is the only effective way to safely navigate a world that is governed by odds, not certainties. And almost everything related to money exists in that kind of world.
Morgan Housel • The Psychology of Money: Timeless lessons on wealth, greed, and happiness
Focus on the IRR, not the margins. Margins are an output, not an input.
Ryan • Mark Leonard Letters
ranges all the way from just 20 percent for very stable firms with wide economic moats to 60 percent for high-risk stocks with no competitive advantages. On average, we require a 30 percent to 40 percent margin of safety for most firms.
Pat Dorsey • The Five Rules for Successful Stock Investing: Morningstar's Guide to Building Wealth and Winning in the Market

Trend trading relies on three golden tenets: follow the trend, cut losses short and let profits run.