Nowadays there's simulators that you can use online for free, to get a grip on what to do when it comes to adjustments and stuff. You'll also discover combination of credit & debit strategies aswell when you play with those simulators.

I have a P.hD in Finance & Private Equity from a reputed college in London and let me tell you, theories are never enough to put you on the track of consistent earnings. No wonder many of my batchmates decided to choose the teaching path.