I will give you a concise answer according to your request.
The first question:
Wang Xizhi has made great contributions to calligraphy. He created a new style of branch calligraphy since the Han and Wei Dynasties, and calligraphers of all dynasties were influenced by him. His famous work "Preface to Lanting" is even more praised as "the first calligraphy in the world". In the Tang Dynasty, monk Huairen collected a tablet [Preface to the Holy Teaching] for Emperor Taizong in the words of Wang Xizhi, which is very famous. Everyone who learns running script should practice this tablet. From the above points, we can see Wang Xizhi's great influence on calligraphy.
Second, Wang Xizhi was a famous calligrapher in the Eastern Jin Dynasty. Studying Wang Xizhi's calligraphy can help us understand the brushwork of Jin people to a certain extent, which is of great reference significance to the study of Wang family. Therefore, calligraphers of all ages are keen to study Wang Xizhi and learn from him.
The second question:
Calligraphy is an art form shared by a few languages in the world, and it is the quintessence of China. Calligraphy art perfectly embodies the charm of Chinese characters. Perfect calligraphy is the best proof of ancient people's lofty artistic accomplishment. Calligraphy refers to writing with its brushwork, structure and composition according to the characteristics and significance of words, making it a beautiful work of art. China's calligraphy has a long history, reflecting the spirit of the times with different styles, and the artistic youth is eternal. Therefore, the study of calligraphy is to study the moral cultivation and artistic taste of ancient and modern people.
I hope you are satisfied with my answer.