My challenge to you: List your top financial mistakes. Not sure you want to invite the ridicule of others? To make everybody a little more comfortable, I’ll go first. Here are my top six: When I started investing in the late 1980s and early 1990s, I bought individual stocks and actively managed mutual funds. Admittedly, I went this route because it allowed this cash-strapped investor to get started in the financial markets with a few hundred dollars,