Losing some fat in the short-term is not an issue for most people. Almost anyone can lose a few pounds by being very strict on their diet for a week or two. But having prolonged fat loss progress and then keeping it off is the hard part.
If you want to set yourself up for long-term fat loss success, the "dieting and exercises strategies" you use need to be in line with this goal. You can already tell beforehand that a "14-day diet plan" won't be successful if you can only maintain it for 2 weeks and then immediately return to the old eating habits that have made you gain excess body fat in the first place.
You have to build good long term habits.
So, when trying to lose excess fat for good, it's important to understand that a flexible diet that accommodates your lifestyle and helps you create good eating habits is more likely to succeed in the long run. This may mean that you'll have slower initial fat loss. But that's totally worth it if you consider the long-term results you will achieve.