Where is the fun money jobs?

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I want to be able to make as much money as my husband does or more, but don't get me wrong I'll take what I can get. At the present time I am self employed, and I have time in between clients that I'm not betting paid for and I could be utilizing that time to be making more money. So I need to find those jobs that you hear of that people work from where ever and when ever. What is this job and how can I be one of those people?