"hot pot is very popular there"和"hot pot is very popular in there "区别

"Hot pot is very popular there" is the correct sentence. "In" should not be used in this sentence. The word "there" refers to a specific location or place, so it is not necessary to use "in" before it. For example, if you are talking about a city or a country where hot pot is popular, you can say "hot pot is very popular there", without using "in". On the other hand, "in" is used to indicate a location within a larger area. For example, you can say "hot pot is very popular in China", which means that hot pot is popular throughout the country of China. However, you would not say "hot pot is very popular in there", as it is not grammatically correct.