To make a plywood cutting grid, start by selecting a piece of plywood that is both sturdy and flat. Measure and mark out equal-sized squares or rectangles on the plywood surface, ensuring they are spaced evenly to create a grid pattern. The size of each square or rectangle can vary based on personal preference or project requirements. Use a straight edge ruler or T-square to ensure accurate measurements and precise markings. Once all the markings are in place, carefully cut along the marked lines using a jigsaw or circular saw equipped with a fine-toothed blade. Sand down any rough edges or corners as needed to create a smooth cutting surface.