The Russian Blue is a Russian breed, while the British Shorthair Blue is a British breed. "Blue" in this context refers to a cat's blue-grey coat; the most common breeds are the Russian Blue and the British Shorthair Blue. The Russian Blue has a slender, elongated body, erect ears, and a thin, delicate face; the British Shorthair Blue has a sturdy, robust body, short, cute ears, and full, round cheeks. 
Daily grooming tips for British Shorthair Blue cats:
1. Feed at regular times and in fixed quantities. Just like humans, cats are prone to various gastrointestinal diseases if their eating habits are irregular. Owners should provide their cats with food at regular times and in fixed quantities. Young kittens or some adult cats may not have any concept of how much they need to eat, so it is essential to pay attention to the amount of food given each time.
2. Food Restrictions. Animal liver is high in Vitamin A, and excessive consumption can lead to Vitamin A poisoning in cats. The correct approach is to offer your British Shorthair cat small amounts of animal liver. Some foods should absolutely not be given to cats, such as chocolate, onions, and grapes.
3. British Shorthair cats shed a lot and lick their fur frequently, which can easily cause hair to accumulate in their digestive system. You need to use a hairbrush to brush your British Shorthair cat's fur every day to remove loose fur.
4. Bathe your British Shorthair cat regularly, but it is recommended to bathe it once every 1 to 2 months. Frequent bathing can accelerate shedding, cause skin diseases, and may also cause stress reactions.