Numbering starts in the upper left corner and moves left to right, top to bottom. For example, planting square A1 is the upper left-hand square (1st column, 1st row), while planting square C4 is the square in the 3rd column and the 4th row. I have yet to find a commercially available garden bed with an included feature for marking off planting squares.
Elevated garden beds are a good solution for plant drainage and compacting of the soil; plants will grow much better because of these facts. Raised beds will warm up faster in the springtime and continue to stay warm longer in the fall which means you can have a longer growing season.
Once you have worked with raised garden beds for any of your gardening whether it is a flower garden, herb garden, or vegetable garden, you may not want to have an in-ground garden again because of how easy they are for cutting, maintaining, and harvesting. Your entire family will enjoy having some garden beds that are raised above the ground including your children.
Each planting square has an address used to identify the square. While the methods for addressing vary, one of the simplest is to use letters for columns and numbers for rows, and the combination of the two identifies the square.