Difference Between Boil And Ulcer What Is The Difference Between Boiling, Poaching & Broiling?

What is the difference between boiling, poaching & broiling? - difference between boil and ulcer

I am new to the kitchen. I begin to eat healthier. Can someone please tell me what is the difference between cooking, poaching and grilling? Is cooking and frying a fish of the same? How exactly a fish without the smell of cooking fish? Boiling is a better choice? It is easy to cook in less oil and use the fastest methods, but remains in good health?