Get a lightproof box or container
Paint the inside black
Cut a small square opening on one side
Cover the opening with thin aluminum foil
Make a tiny pinhole in the center of the foil
Cut a larger opening on the opposite side
Tape tracing paper, wax paper, or photographic paper over the larger opening
Seal all edges with black tape to block light leaks
Point the pinhole side toward the scene
Keep the camera steady
Expose the paper or screen to light
Cover the pinhole after exposure
Develop or view the image as needed