What is the information and basic knowledge about couplets?

The information and basic knowledge about couplets are as follows:

1. There is no limit to the number of words in the top and bottom lines of a couplet, but they must be equal. Both sides of the couplet must correspond to each other.

2. When people put up Spring Festival couplets and blessings in front of their houses, it means that the Spring Festival is officially kicked off.

3. The meanings of the upper and lower couplets must be connected to each other, but not repeated.

4, the words are relative and in the same position: noun to noun, verb to verb, relative words should be on top of the same position, and words in the same position should be relative as far as possible.

5, the traditional habit of couplets is oblique, that is, the last word of the last sentence of the first line with oblique, the last word of the last line of the second line with flat. This is mainly in order to harmonize the sound, the wrong ups and downs, pleasant to the ear, resonant and powerful.