Total carbs are the total number of carbohydrates you consume.
Net carbs are the total daily carbohydrate minus fiber intake.
When counting your carbs on keto, you should be looking at how much fiber you eat.
Fiber is a type of carb that is not easily absorbed by the body (meaning it won't affect blood sugar levels or insulin the same way sugars do). It can be subtracted when looking at controlled carbohydrate intake.