My first mistake in investing was not buying a bad stock, it was buying a stock before I understood what I was doing. I still remember how excited I felt when I bought my first stock in early 2008. I was young, hopeful, and convinced that investing was how people became rich. The problem was simple. I had confidence, but I did not have understanding. This article is not financial advice. I am sharing my own investing lesson so that beginner investors can avoid turning one early mistake into a painful money lesson. Key Takeaways A stock that looks cheap is not always a good investment. Big companies and banks can still fall sharply during bad markets. Putting too much money into one stock can hurt your whole investing journey. Investing without understanding the risk is closer to gambling than investing. The goal is not to get rich quickly, but to build wealth in a way you can live with....