Although dieting is a multi-million pound industry, it boils down to one simple fact - you must burn more calories than you ingest, it really is that simple.
If you eat a balanced diet, with minimal carbs and sugars, and exercise regularly and sensibly, and avoid large amounts of alcohol (beer is fattening) you will loose weight.
There is no 'simple' solution.
Weight loss involves pain and inconvenience, followed by pleasure and satisfaction.
Be disciplined, and stick to the regime, and you will loose wieght, tone up, look and feel better.