Although mobile phones, Pads, and computers are very popular nowadays, there are still a large number of people who like to use pen and paper to take notes. However, there are all kinds of books on the market, with advantages and disadvantages, and it is difficult to have a satisfactory book. for example: The style of some books is very good, but the water is smeared, which is very painful for those who use fountain pens; Some notebook paper is very good, but the price is very expensive, and the cost performance is very low; The A5 book is too small to carry a wide range of graffiti production; Some books are inappropriate thickness, and you have to find something to put your hands on when you write on the edge; The notebook wants to be scanned and saved, but the bound notebook is not beautiful to copy; The book has a single style, a single purpose, the line is too thick, etc. so: Do you want an easy way to keep records? Simple, convenient, cheap, and more flexible, isn't A4 paper the best choice? ! Drawer clips, file bags, scanned into electronic versions, etc., you can save them as you want. If you want to practice calligraphy, take notes, and manage schedules, I will give you all the templates you want, just in this app~