Sheesh, that's a bit like being asked "how can I learn computers?" It's a very broad question. Better questions might be "what within the domain of business k

Sheesh, that's a bit like being asked "how can I learn computers?" It's a very broad question. Better questions might be "what within the domain of business knowledge do I need to understand in order to achieve my goal(s)?" And then naturally, the most important question feeding into that is, "what are my goals?" I think if you want to have a better basic understanding of how large economies work and how that effects political policy, I'd recommend studying macroeconomics. If you want to understand the basic functioning of a business and how it relates to customers, I'd recommend marketing. If you want to understand how businesses are evaluated, how they borrow and spend money, how they evaluate internal processes, I'd recommend finance. If you want to understand how businesses optimize their processes, and design efficiency into their processes, then you should study operations research (aka operations analysis). If you want to understand how a business keeps track of what it's doing internally, and how it's performing internally and how resources are allocated, and how it handles loans and taxes, then study accounting. If you want to understand how to acquire talent and insure that employees are being treated in a way that respected laws on fairness, and how to manage worker's comp, pensions, health insurance, etc. then study human resources. If you want to know how businesses handle their relationships with their communities and the media, then study public relations. I hope this helps a bit.