How should I prepare plywood for finishing by sanding plywood?

To prepare plywood for finishing by sanding, start by sanding the surface with a fine-grit sandpaper to smooth out any rough areas or imperfections. Sand in the direction of the wood grain to avoid damaging the plywood. After sanding, wipe down the surface with a damp cloth to remove any dust or debris. Repeat the sanding process with a finer grit sandpaper for a smoother finish. Finally, apply a primer or sealer before applying the final finish to ensure a professional-looking result.