What Fruits Should I Avoid on Keto?

Do not confuse nutrition with carbs, lots of fruits are highly nutritious but simply have high carbs and sugars. I advise moderation over outright banning of certain fruits. This way you do not forsake useful macronutrients.

For example apples and watermelon are not traditionally keto, their carb counts per serving are very high. The answer is to take a small slice of apple or watermelon as opposed to a whole one. Strawberries are ok in moderation and most berries are also fine. you might enjoy this more detailed post on fruits and keto.