How to appreciate Wang Wei's classic five-character quatrain Farewell? What is the creative background of this poem?

This is a very classic farewell poem. Who can see his farewell to his friends from this poem? It also expresses my feelings. It is a good farewell poem. This poem was written when I bid farewell to my friends. I felt very sorry when I bid farewell to my friends, and thought that it might be difficult to meet again in the future, so I created such a poem.