Can I get a job or a small business to do in my desktop at home for totally free of cost?

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I am class 12th passed. And I have only basic knowledge of computer from NIIT. So I want to know, Can I get a job/small business to do in my desktop at home for totally free of cost? Because there are all scam related sites who promise to pay money after the works you will do. But it never happens. So, are there any legitimate sites for totally free you know?

Can I get a job or a small business to do in my desktop at home for totally free of cost?