Finance is Finance, managing funds ?

Finance is arranging funds and using these funds in most productive activities to gain benefits. Every individual try to use money in its best way. why is it required to mange fund, why we need to be thoughtful before investing money, why we always require money for doing every business, why we think about source from where we get money? We all need to take lots of decisions to deal with money as it is scare resource, and decisions related to finance is contain huge amount and one the decision is taken , it is irreversible or reversing it can be costly.