The keto diet can be really tricky, and if you're not doing it right, you may not be seeing the results you're expecting from it. It is a very restrictive diet in terms of food groups you can be eating, but because your meals will be higher in fat, your taste buds won't have to suffer. Essentially, you want to starve your body of carbohydrates, not necessarily calories. Our bodies naturally enter a state of ketosis when we're starved, but by removing carbs from the diet, you can force your body into this state and start burning that fat your body has been holding on to for energy rather than sugars.
Whether you're just starting this diet or have been doing it, if you've caught yourself having a Regina George moment asking, "Is butter a carb?" then you need to keep reading. Sometimes it can get confusing if you are just jumping into this on what is considered a carbohydrate, protein, and fat. Some people also practice the keto diet differently from others. For example, some limit their carbs to 50 grams and others aim for 0 grams. It's all dependent on your body at the end of the day. Some bodies can enter ketosis with more carb intake than others.
Regardless of how you keto though, these are foods you are going to want to stay far away from.