Here are three of the week's top pieces of financial advice, gathered from around the web: Research your fund's feesIndividual investors are wasting up to $7 billion a year on "expensive index funds that are no better than cheaper funds — without even realizing it," said Gail MarksJarvis at Reuters. A study by investment research firm Morningstar found that investors tend to blindly diversify when selecting investment funds — and pay little attention to fees.