Rather than making a large initial bet, follow the VC model of making a small investment first. Only increase your position size once the company has proven its model, reduced technological risk, or solved major distribution challenges, effectively de-risking the core thesis.

The common advice to 'buy more cheaper' when a stock falls is a flawed strategy. It often leads to allocating more capital to your worst ideas and compounding mistakes. Instead of automatically adding to losers, the bar for re-investment should be exceptionally high.

Many investors wrongly equate high conviction with making a large initial investment. A more evolved approach is to start with smaller at-cost positions, allowing a company's performance to earn its eventual large weighting in the portfolio. This mitigates risk and improves decision-making.

To avoid emotional, performance-chasing mistakes, write down your selling criteria in advance and intentionally exclude recent performance from the list. This forces a focus on more rational reasons, such as a broken investment thesis, manager changes, excessive fees, or shifting personal goals, thereby preventing reactionary decisions based on market noise.

To pursue massive upside, one must first survive. Gardner mitigates risk by never allocating more than 5% of his portfolio to any new position. This discipline prevents catastrophic losses from a single bad idea, ensuring he stays in the game long enough for the big winners to emerge.

To manage the risk of volatile or 'bubble' stocks, investors should systematically take profits until their original cost basis is recovered. After this point, any remaining shares represent 'house money.' This simple mechanical rule removes emotion and protects principal while allowing for continued upside exposure.

Contrary to the "buy the dip" mentality, David Gardner's strategy involves adding to positions that have already appreciated. This "add up, don't double down" approach concentrates capital in proven performers and prevents throwing good money after bad, which he identifies as the primary way investors go broke.

Rather than passively holding a stock, the "buy and optimize" strategy involves actively managing its weighting in a portfolio. As a stock becomes more expensive relative to its intrinsic value, the position is trimmed, and when it gets cheaper, it is increased, creating an additional layer of return.

Evaluate every check, including follow-on investments, independently from prior commitments. The decision should be based solely on the current risk-adjusted value of that capital, not on past investments, which prevents throwing good money after bad.