Avoiding ruin in investing isn't about being conservative—it's about understanding the asymmetric mathematics of loss. A 50% loss needs a 100% gain just to break even.

A practical SWOT framework for analyzing competitive advantage. Five types of moats: switching costs, brand loyalty, scale economies, network effects, proprietary IP.

Four key business health metrics: organic revenue growth, gross margin trend, free cash flow conversion, and net debt trajectory. Learn to read financial statements.

How management deploys capital tells you whether they're focused on shareholder value. The five-tier hierarchy: reinvestment, acquisitions, debt reduction, buybacks, dividends.

How to identify when a stock has become overvalued. Practical frameworks: relative valuation, market sentiment, and competitive advantage analysis.

Assessing company culture through earnings call tone, annual letters, employee reviews on Glassdoor, and public statements reveals how management actually thinks.

Benjamin Graham's most important principle: only buy when you have a genuine margin of safety—when price is meaningfully below your estimate of intrinsic value.

A concentrated stock portfolio—owning 5–15 great businesses—consistently beats owning 50 mediocre ones. Here's the mathematical and practical case for why.

Six fundamental business models: SaaS, marketplace, franchise, direct-to-consumer, capital-intensive, and consumer brand. Each has distinct economics and valuation logic.

Strategy is the link between a business's competitive advantage and its financial returns. Learn to evaluate management strategy and capital allocation decisions.

How much capital to allocate to each stock is more important than which stocks to own. The Kelly Criterion and conviction-based sizing explained.

How cognitive biases—loss aversion, availability bias, herd instinct—distort our perception of risk and lead to poor investment decisions.

How many stocks to own depends on your research capacity, conviction, and risk tolerance. Here's a practical framework to find the right number for you—backed by data.

The difference between volatility and risk: a stock that falls 40% and recovers has low long-term risk despite high short-term volatility. A business that deteriorates has high risk.

Evaluating management quality through proxy statements, compensation structures, historical track records, and evidence of genuine alignment with shareholders.