RE: ????? (opposite... less coal)"Don't put all your eggs in the same bag... diversification is key..."
Warren Buffet says that is crap. Buy a few good companies, and concentrate on those. It's better to intimately know a few companies that you own than to barely understand dozens or hundreds of companies. That way you can easily react accordingly when things go bad. Massive gains are made in one place generally, and are diluted by excess ownership of companies with mediocre success.
HT