Can ancient calligraphy be written to the left and modern calligraphy to the right be universal?

No, ancient Chinese characters are written vertically from top to bottom, from right to left. The modern habit is to write horizontally from left to right, and the rows are arranged from top to bottom. There are essential differences between the two and they cannot be used universally. If you write soft pen calligraphy, it is still recommended to follow the ancient method, write from top to bottom and arrange from right to right. There are two ways to write hard pen calligraphy. Personally, the ancient law is a kind of inheritance, which is beyond reproach, because it belongs to the same category as calligraphy; Modern writing from left to right is also acceptable, because the pen itself is a modern writing tool, and it is no exaggeration. I hope I can help you.