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Should a high-school student invest their (relative meager) savings?
At your age (heck, at MY age :-)) I would not think about doing any of those types of investments (not savings) on your own, unless you are really interested in the investment process for its own sake, and are willing to devote a lot of time to investigating companies in order to try to pick good investments. Instead, find a good mutual fund from say Vanguard or TRP, put your money in there, and relax.  Depending on your short-term goals (e.g. will you expect to need the money for college?) you could pick either an index fund, or a low-risk, mostly bond fund.