Try not to over think cardio too much. the most effective form of cardio for fat loss is the one you enjoy. otherwise it will become a chore, which is bad for numerous reasons and also you will find every excuse in the book not to do it. i think the best form is some form of group competitive activity as these are often HIIT ( im not HIIT all the way different approaches work for different people, i myself like a combination) and peer pressure is an excellent way to ensure you keep it up.

now as for making the cardio you perform more efficient - you need to keep insulin & RQ (respiratory quotient) low if these are not low you arent getting the full possible benifits of fat loss. remember amino acids can trigger an insulin response. you need a way to realise FFAs the body will do this naturally with exercise but there are certain things that can be done to increase this. and once you have increased release of FFAs you need to use them ie exercise.

I always perform cardio
First thing on AM Fasted. no carbs consumed after 6pm the previous evening.
cup of black coffee 30-45mins before
then fast after completing cardio as we know excess calories are still burnt once we stop moving and so i want to keep insulin and RQ low and reap all the rewards of the cardio I have performed.

Any more questions fire away

PS, I never, ever do any cardio. Cardio sucks! :-)

How can I get rid of body fat?It's been my problem for so long.Can anyone help me?

jogging

Jogging?? What kind of exercise is that?
Start doing some serious lifting, and sprint running, forget silly jogging, it's for wimps.