Are modern poems written horizontally? Are there spaces in each line?

Write horizontally, leaving spaces in each line. Generally, there are four spaces before each sentence, and each paragraph has one line. If it is a special calligraphy manuscript paper, there are not many spaces in each line, so it can be centered. Generally speaking, there are fewer spaces on the left than on the right. There are also fans, which should be arranged vertically from right to left, with each row on the top and the signature on the lower left.