What skills do you have that enable you to earn more money outside of work?

Web design :)

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Teaching

To keep it short and to the point. Sales Skills, being able to sell will make you money. But, what do you sell? and to who? and how will these people know about what you are selling? All additional skills you need to make money outside of work. Really depends on what you are trying to do. I'd suggest take one problem you sold yourself, make a twitter account and just talk about that and build a community then sell them the solution to your own problem