Losing fat, barring medical conditions, is very similar to balancing a budget; you find out your TDEE (basically your caloric balance) and then eat under that. Free (or very cheap) apps like MyFitnessPal help track and accomplish the latter.
That's it. If you exercise while you're at it you'll also lose relatively little muscle while you're eating at a deficit, which accelerates the fat loss. Either way it'll go away - although a lot of things factor into it, such as the way each individual body uses up calories (i.e. how large a portion of the energy deficit it taps into its fat reserves to replenish).
There are many good, free resources out there to help. I recommend the LoseIt subreddit and the associated FAQ.