There really is no right answer to your question. The ways people chose to lose range, according to folks who post here, from someone who ate no more than ten grams of fat a day to people who include up to 40 or 50% of their daily calories from fat. In the latter case, I believe they focus on good fats...monounsaturated ones, as opposed to saturated fats. There are low fat diets and then there are the low carb diets that are higher in fat. Nothing is right or wrong; it's all about what works for you. Splitting hairs further, some advocate a higher percentage of fats and emphasize healthy fats (like from nuts, fish, avocados, olive oil, etc.); others don't agree with the contention that saturated fat leads to heart problems and high cholesterol and are therefore less discriminating about the type of fat they eat. If you ask 100 people, you will likely get 100 different answers. The FDA or whatever agency's recommendation is no more than 30% of calories from fat...but that is also subject to a lot of factors, including possibly outdated science and influence of various lobbying agencies. So it's definitely not simple!
If you really want an answer from someone, you could ask your doctor. Otherwise, I would advise you to educate yourself...google it, read various positions, then think about what you can live with. I know for me personally, I can't stomach a lot of fatty foods, even the good ones, so if I get to 20, 25%, I'm lucky. Others are different. The best diet for you is actually a lifestyle that you can live with. Try a few different things based on what you read and hear, and learn to listen to your body and you will know what works for you when you find yourself feeling your best.