A pinhole camera forms an image through a very small opening instead of a conventional lens. This encourages a slower approach: framing, the stability of the camera and the passage of time become central parts of the photograph.
Build a repeatable exposure experiment
Begin with a stable surface and a scene with a clear range of tones. Record the material, light conditions and exposure duration. Change one variable at a time so you can compare the results rather than guessing why a frame looks different.
Look for subjects whose shapes remain interesting without fine detail. A wall, a window or a path can make an effective first study. Protect light-sensitive material from stray light when loading and unloading.