Can I stick couplets on the security door of the courtyard on the first floor?

It's better this way. In order to welcome the new year, it is also very festive to post couplets or blessings on the security door. Couplets, one of the traditional cultures in China, also called couplets or couplets, are antithetical sentences written on paper, cloth or engraved on bamboo, wood and columns. The antithesis of couplets is neat and even.