My country

Everyone has his their own country, and loves it very much. My motherland is China which is a beautiful country, she with a has long history, and rich culture. there are deep cultual backgroud about her.
In my country, there are many beautiful places of interest are very beautiful. The capital of China is Beijing which it is a historic city. in Here, you can climb the Great Wall; it's a long wall, and standing on the top of it you can feeil his it's majesty . Tiananmen Square is Chinese landmark trademark; there are so many beautiful sights in here , I think you will fall in love with it if you come here!
In China, you also can eat delicious food , such as Beijing roast duck, it has good taste which tastes great. There is are also many snacks too to enjoy as well, and local people are very enthusiastic. Welcome to china, friends around the world!

My country

Everyone has his their (avoid gender-specific pronouns, and use the singular-they/their) own country, and loves it very much. My motherland is China, which is a beautiful country, she has a long history, and there are deep cultureal background about her.
In my country, there are many places of interest are very great beautyiful. The capital of China is Beijing, which itself is a/an historic city, in (in Chinese you say 'in here' '在这‘, but not in English) where you can climb the Great Wall - it is a tremendously/amazingly/incredibly long wall - standing on the top you can feel his its majesty . Tiananmen square is another notable Chinese landmark/symbol. trademark There are so many beautiful sights in here , I think you will fall in love with it if you come here!
In China you also can eat delicious food, such as Beijing roast duck, it which has good wonderful taste, there is are many delectable snacks too, and local people are very enthusiastic! Welcome to China, friends around the world !

Capital letters for proper nouns (China, Beijing...)

Space after fullstop, comma etc. 

'Here', 'there', 'this', 'that' rarely have the preposition 'in' with them, unless it is very specifically inside.  For example: Where do you want me to put the flour? Put it right in here, inside the jar'  (pointing at the particular jar)