The writing background of Shakespeare's twenty-ninth sonnet

Shakespeare's sonnets from 18 to 16 were written for a noble young man, who was handsome. The poet mainly praised his beauty and friendship with him, and the 29th was one of them. This poem enthusiastically praises love. When the poet wrote this poem, he gave full play to the advantages of sonnets, and adopted the method of restraining first and promoting later, which showed the development and changes of the poet's thoughts and feelings.