Please Help Me on How to Make Extra Income

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I'm a full time employee. I need to know or how can I earn extra income by using the internet. I have read many articles from net but seems like there's a need a lot of readings and most of it are you have to pay or invest to earn more. I'm afraid, if I get into wrong sites of investment I lost lot of money cause they are quite expensive. Please help:-). I need advice. I'm sure there's a lot very good mentor here.