What is the most important concept in marketing?
The four P's: product, price, place, and promotion. From these four things, come many different pieces of marketing, but without a thorough understanding of the four P's, you will not be able to effectively marketing any good/service.
Why is it important to have a good understanding of English?
You need to be able to not only speak well, but to write well also. Understanding English will allow you to effectively get your message across to various audiences.
What is a business?
A business is an some form of an organization where goods and services are exchanged for one another or for money. Every business requires some form of investment and enough customers to make it profitable. A business can be privately owned, not-for-profit or state-owned.