is work from home for real?

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When i browse the internet i saw ads that says you can earn while you work at home.This is very catchy and i really want to try it.But i'm afraid because it might be a scam or something and they also requires you to cash out in order to start working at their sites. Working at home will be a big help since i always want to go online but can you suggest a legitimate sites that really pays.And are there sites that do not require you to pay cash to be a member?