What are some investments a student below 18 can make?

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I think the best investment you can make is on yourself. Among all forms of investment, i would say that investing in your own business is best. This is because you will be able to leverage on what you know or your strengths.

I'm not into stock investing because the stock market is full of professional investors. Many have army of people doing research and coming out with investment strategies. Just think about it, how many people you know are full time investors and making lots of money (without doing some form of training on the side).

I was once young and also dreamt of being a full time trader. Alas, it was just a dream coz making consistent returns from the stock market is actually much harder than it looks...