Sounds like you're already doing some research and are off to a good start.<p>There's a couple book recommendations in other comments that mention some famous great books about investing. "The Intelligent Investor" for example is <i>the</i> classic to read on the subject. Just a heads up, many of these books about investing are about actively investing yourself, in particular picking stocks yourself, which has almost nothing to do with investing via broad passive index funds. I'm not saying don't read those books, please do research. However I just wanted to write a heads up: many people who read these books with a goal to learn more investing in general and who prefer to stick with broad passive index funds for their own money, well somehow almost everyone I see who reads these books ends up starting to try to actively pick stocks afterwards anyway. So I fully agree do a lot of research, learn about investing as much as you can and read any/all books that might interest you. Just wanted to give the warning before you do read these books...that as good as those books are on investing, they are also like gateway drugs that often make people want to try their hand at picking stocks and timing the market after they read them. Ultimately it's your money and up to you.<p>Another option, in addition to reading online and reading books, is to look into hiring a registered professional investment advisor help give you more in-depth information and answers that are specific to your situation.<p>Some investment advisors work off a percentage of your assets and they invest your money on your behalf but there are also many many other registered investment advisors who just work for an hourly fee when you go to meet them and they don't even offer any investing services at all. They offer information and knowledge about investing, the meeting is 1 on 1, and they charge by the hour or by how long the session takes.<p>One reason I recommend looking into a fee-based advisor like this is to answer your questions but also provide answers that are specific to you; based on things like your age, your goals, any other assets you have (like a home), factoring in if you have a 401(k) or something like it through your employment, etc...Of course a professional can answer your questions about various funds too, but there is a host of other issues to consider when picking passive index funds. For example tax-advantaged investing is going to be unique to you. You want to avoid overpaying taxes on investment gains, many people get this wrong without professional assistance and could have saved a lot of money had they set things up right earlier. Likewise, what State you live in or if you own a home might affect which types of passive index funds make sense for you. Just another thing maybe worth researching as you go through your due diligence. Best of luck.