Prepared by A-J | Author brand: 盡職生活｜阿J的普通人理財筆記
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-15 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-15 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
Key point: Remember: individual stocks can lose principal. This page provides education and a research framework only, not stock picks or entry/exit signals.
Being right about a company does not eliminate risk
Even a strong company can be purchased at an excessive valuation or decline sharply during a market correction.
Position size controls the damage from one mistake
A 30% decline has a very different portfolio impact when a position is 5% versus 50% of total assets.
Leverage amplifies gains and losses
Borrowing to invest or using margin adds interest costs, maintenance requirements, and forced-liquidation risk on top of market volatility.
Survival comes before return
For household finance, avoiding a cash-flow crisis caused by one stock or leverage is more important than maximizing one-period returns.
How to verify information
Start with company filings, exchange/regulatory sources, and primary disclosures before relying on media summaries or market commentary. When sources conflict, prioritize formal filings and primary sources.
General investing education only. Not a recommendation, trading instruction, or promise of returns.