Excuse me, what materials and processes are needed to make LED light boxes, and how much profit is there?

Take 50X 100cm as an example, the cost is about 150 yuan, and the price is about 350 yuan (not counting the installation fee). Beginners can make one 1 day at first, and can make two or three 1 day after proficiency. There is no technical content. There are many online tutorials, and the things you use can be bought online, but they are of little use in the village. Generally used in Internet cafes, hotels, supermarkets, tobacco hotels, barbershops, etc.