How Do You Become a Business Manager

I'm looking at Craigslist for jobs and came across a position for a business manager. Sounds like an awesome job but I have no idea how to do any of the things the job is asking for. How do I learn these things so I can apply and get my first job? I have a liberal arts degree from a good school.

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Primary duties include:

Coordinate all aspects of the weekly forecasts, monthly operational reviews, and annual budgets for the businesses under scope, prepare and distribute monthly business P&L and/or departmental expense reports, provide management with analysis and explanations of key variances and provide expertise to leadership as well as assist with long term planning.

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