People invest to accumulate funds for specific purposes like wealth creation, financial security, and retirement planning. Investments require sacrificing something today for future returns. There are real assets like real estate and equipment, and financial assets that are claims against real assets like stocks and bonds. Risk and expected return are directly related - higher risk investments are expected to provide higher returns. Setting clear investment objectives involves considering factors like risk tolerance, time horizon, need for income versus capital appreciation, tax implications, and more. The relationship between risk and return is a key principle in investing.