If you are good at some subject, especially maths, science subjects, accounts or economics, you will have an upper hand in this business. There are plenty of such coaching centers so you will have to face some stiff competition in the beginning. But if you can get good results from your students, congratulations! You have made yourself a name and now parents will send their children in big groups to your center.
Portfolio income can come from multiple sources – interest/bond coupons, stock dividends, financial strategies including derivatives and capital growth.  Each offers some cash flow and some also offer potential capital gain with some risk from liquidity and volatile prices.  In this low-yield environment, many investors rely too heavily on cash flows and to pursue this are venturing further into riskier areas than they’d normally consider.