The Missouri Secretary of State's Learn the ABC’s of Investing (pdf) gives you a good overview of investing, including information on the Missouri Investor Bill of Rights and tips for avoiding fraud.
Tutorials from Money 101 and TheStreet University guide you through a step-by-step guide to investments.
Glossaries such as Bloomberg Financial Glossary and InvestorWords teach you the language of investing.
Certain financial information providers have built strong reputations for having current, reliable and unbiased data and advice.
While there certainly are other good sites, you may want to contact us about any site whose ownership, authorship or approach seem iffy.