Watching CNBC or financial media all day is a recipe for a terrible investing philosophy because it creates information overload and behavioral distortion without providing actionable insight.

Even professional quant managers unconsciously chase performance by using past performance to select factors for multifactor portfolios, which is a 'backdoor form of performance chasing' in a group that thinks they don't chase performance.

Executing the basics correctly—diversification, tax efficiency, low fees, base rate analysis—puts you ahead of 90% of investors because most skip the fundamentals to pursue complexity and excitement.

Never engage in resulting—judging the quality of decisions by outcomes rather than process—because outcomes have luck components; maintain your process even during bad luck periods.

Know what you own (understand your holdings) even if delegated to an advisor, and keep fees and taxes minimal, because these two factors determine the vast majority of wealth building outcomes.

Stop thinking about savings as investments; instead, think of them as insurance against need and inflation protection, because treating savings as wealth-building vehicles encourages reckless risk-taking that can leave them underwater for decades.

If you concentrate investments in one asset class or strategy style (deep value over the last decade), you create style concentration risk that can lead to underperformance even if asset allocation is theoretically correct.

Modern investing offers unprecedented access to low-cost, tax-efficient strategies (ETFs) that were previously available only to wealthy individuals and institutions, making individual investors the beneficiaries of democratized financial markets.