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If I have $1000 to invest in penny stocks online, should I diversify risk and invest in many of them or should I invest in just in one?
I've never invested in penny stocks. My #1 investing rule, buy what you know and use.  People get burned because they hear about the next big thing, go invest! to just end up losing everything because they have no clue in what they're investing in. From what I've found, until you have minimum of $5k to invest, put everything in a single investment. The reason for this, as others have mentioned, is that commissions eat up just about all your profits.  My opinion, don't put it in a bond, returns are garbage right now - however they are "safe". Because this is $1000 we're talking about and not your life savings, put it in a equity like a stock to try and maximize your return. I aim for 15% returns on stocks and can generally achieve 10-15% consistently. The problem is when you get greedy and keep thinking it will go above once you're at 10-15%. Sell it. Sell it right away :) If it drops down -15% you have to be willing to accept that risk. The nice thing is that you can wait it out. I try to put a 3 month time frame on things I buy to make money.  Once you start getting a more sizable chunk of money to play around with you should start to diversify. In Canada at least, once you have a trading account with a decent size investment the commissions get reduced to like $10 a trade. With your consistent 10% returns and additional savings you'll start to build up your portfolio. Keep at it and best of luck!