Fat and carbs are energy while protein is a building block. Since you are reducing your carb intake, you will automatically be eating more fat. However, the metabolic state of ketosis is reached by carb reduction, not by the amount of fat.
If your goal is to lose weight, there really is no need to focus on getting extra fat or even reaching the fat grams that the free keto calculator gives you every day.
Sources of fat
However, if you aren't satiated, adding fat should help. Popular sources for fat on keto include saturated fats from animals such as butter, ghee, tallow, cheese and lard. Most people tolerate these best when they're taken in natural form with the protein from the animal. Nuts can be a good source of additional fat as well.
If cheese agrees with your system it can be very useful on keto. Just keep in mind that cheese is also very energy-dense so if weight loss is a goal, you may want to moderate your cheese intake. A great example of using cheese in your keto diet is on top of low carb vegetables like spinach, other leafy greens, broccoli and cauliflower. Cauliflower rice with cheese is a great go-to side whether you're just starting keto or a seasoned vet. Even kids will eat broccoli when it's covered in cheese!
Avoid seed and vegetable oils
Good fats from plant sources include avocado and avocado oil, coconut oil and olives or olive oil. Please avoid soy and corn/canola oils at all costs! There is emerging evidence that these polyunsaturated fats can actually inhibit your fat cells' ability to release fat easily. Your whole body is made from saturated fats...the body knows how to deal with these easily.
I'm personally a fan of coconut oil for a few reasons. There is evidence that it may help with your body's ability to burn fat resulting in more weight loss, increases feelings of fullness can be used as immediate fuel and are less likely to be stored as fat. In addition, the work of Dr. Mary Newport shows that coconut oil/MCTs may be extremely useful in treating Alzheimer's, dementia and normal changes in an aging brain.