The first couplet is on the right.
When pasting couplets, the ancient writing habit was to write from the right to the top, with the right at the top, that is, the first couplet is on the right and the second couplet is on the left. Generally speaking, couplets require "Zhi Qi Qi Ping Fa": Qi (the third and fourth tones) start and Ping (the first and second tones) finish. That is, the last word in the couplet is the oblique tone. , the last word in flat tone is the second line.
Extended information:
Posting Spring Festival couplets is a traditional habit of the Chinese people. Every year when the Spring Festival comes, every household pastes various couplets on their doors, adding a festive color to the festival.
Couplets are divided into upper and lower couplets and cannot be posted at will. There are two issues to be clarified here, one is to distinguish the upper and lower lines, and the other is the position of the upper and lower lines. A brief introduction is as follows:
The character at the end of the first couplet should be the "廄" sound, which is the "three tones" or "four tones" in modern Chinese. The "廄" sound gives people the impression that the words have not been finished yet. The word at the end of the second line should be the "ping" sound, which is the "first" or "second tone" in modern Chinese. The "ping" sound gives people the feeling that the words have been finished.
For example: Business is prosperous all over the world, and wealth is abundant as far as Sanjiang. "Hai" has three sounds, so this sentence should be the first couplet (the first couplet); "Jiang" has one sound, and this sentence should be the second couplet (the last couplet). When pasting couplets, the previous sentence should be pasted on the right side, because books in the past were arranged vertically and were read from the right side.
Reference materials: Posting couplets - Baidu Encyclopedia