I heard about complex fat and about water fat which is not that hard to get rid of as complex fat.
I would like to know more about them and how to get rid of them and how to know if my fats are complex or water fats.
I've never heard of the term "water fat" or "complex fat". However there are two common ways that people will divide human body fat: classing it as either brown or white fat or abdominal or subcutaneous fat.
Brown fat vs. White fat
White adipose tissute (i.e White fat) is the most common type of body fat in humans, and makes up nearly all body fat in adults. When people think of body fat, this is what they picture - a calorie rich storage mechanism. It has a small function in thermoregulation of body temperature through insultation, but is promarily a calorie storage tissue.
Brown adipose tissue (i.e Brown fat) is a relatively new discover. In humans brown fat only really appears in measurable amounts in new born children. Before they learn to shiver, brown fat is a tissue that consumes calories to actively (rather than passively) produce body heat. It is very rare to seen naturally occuring in adult humans, and some research is being performed to see if we can promote brown fat growth in adults to help weight loss.
Abdominal vs Subcutaneous fat
The other main way people classify fat is less about its makeup and more about its position in the body.
Subcutaneous fat is excess fat that is stored under the skin, but above muscles and away from organs. Again this is the classic picture of what people think of as fat - the folds on your body you can grab.
Abdominal fat is excess fat that resides within the abdominal cavity, that is underneath your abs. This is primarily the same tissue as subcutaneous fat. The main difference is the health risks related to abdominal obesity, however this is difficult to isolate, as if you have large amounts of abdominal fat you most likely already have large amounts of subcutaneous fat as well.
In the end it doesn't matter what type of fat you have
It is a myth that you can target where you lose fat. Fat gain and loss is a systemic change that is related to your genetics and hormones. If you are looking at getting healthy minimising your fat will minimise it systemically, and in ways that are most benficial. You can never get rid of fat completely, even abdominal fat and fats around organs are important for hormone regulation.
Just eat healthy, exercise, and aim to lose fat - but don't stress on where or how the fat comes off and you will be pleased with the results.