Next to the products, you can find ready-made templates prepared in various formats. Very useful for design. They contain lines for text safe areas, bleed areas, edges, fold lines, etc. Just download, open in a graphics application and design.
Design help files
Some products include descriptions of the correct preparation of files for printing. They contain technical information useful for design.
Examples of correctly prepared files
Some products, especially the more complex ones, come with sample files. They show the practical application of instructions and tips. These are examples of properly prepared and ready-to-print files.