Do you need to write commas when writing calligraphy?

If you are freehand, you should add a comma in the middle of the whole sentence. If you have various brushes and the like, you don't have to write commas according to the format. You don't need to write commas when writing couplets. It's up to you. You don't have to add it if you want. It's up to you. Never mind, please adopt _