S391: The Biggest Investing Mistakes and How to Avoid Them

The biggest investing mistakes destroy more wealth than market crashes—and most of them are avoidable. In this episode of the Rich Dad StockCast, host Del Denney sits down with Rich Dad expert Andy Tanner to break down the most common investing errors and how to prevent them.

Andy explains that the number one mistake investors make is entering the market without proper education. Unlike professions that require years of training, many people jump into investing without a system, a mentor, or an understanding of risk. This lack of preparation often leads to costly decisions that could have been avoided.

The conversation dives into critical mistakes that separate successful investors from those who struggle:

• Ignoring education and mentorship before investing

• Mismanaging risk through poor position sizing

• Trading based on predictions instead of preparation

• Becoming emotionally attached to investments

• Overconfidence and failing to recognize downside risk

Andy emphasizes that markets are inherently unpredictable. Investors who rely on forecasts set themselves up for failure, while those who prepare for multiple outcomes build resilience and consistency. He outlines a systems-based approach that focuses on managing risk, not chasing returns.

You'll also learn why position sizing is one of the most overlooked yet critical factors in investing, how professional investors think about probabilities, and why even high-probability trades can fail without proper risk controls.

Beyond strategy, this episode highlights a deeper truth: investing is a personal development journey. Success requires discipline, emotional control, and the ability to stay rational under pressure. Without these traits, even the best strategies will break down.

This topic matters now because more people are entering the markets than ever before—often without the education or systems required to succeed. Avoiding these common mistakes can mean the difference between long-term wealth and repeated financial setbacks.

🎯 Visit https://bit.ly/3JsRdmj for access to FREE investing tools, including Andy's "Power of 6" ebook.

00:00 Introduction
02:03 Learning From Failure
04:00 Mistake One No Education
07:06 Mistake Two Position Sizing
12:13 Mistake Three Stop Predicting
17:51 Arrogance and Sunk Costs
21:56 Solutions Find a Mentor
27:39 Affording Coaching Mindset
31:08 Rebuild With Resilience
34:19 Final Takeaways and Outro