Schwab U.S. Dividend Equity ETF offers an attractive yield and a unique investment approach that could serve you well for the rest of your life.Stocks in the S&P 500 (^GSPC -0.50%) yield an average of roughly 1.2% today. That makes the 3.6% yield of Schwab U.S. Dividend Equity ETF (SCHD -0.55%) look downright huge. But the attractive yield on offer from this dividend-focused exchange-traded fund (ETF) is just the start of the story. Here's why this somewhat complicated ETF could set you up for a lifetime of ...