What are the 3 types of cash flows?

There are 3 types of cash flow and they come from:

Operating Activities – cash flow from day to day running of business
Investments – cash flow from future ventures
Financing – cash flow from bank loans, equity and dividends

What is a cash flow example? Does cash flow include salaries? What are the best cash flow businesses? How do you explain cash flow? How is cash flow calculated? Why is cash flow so important? What is considered a good cash flow?