Measure rice and rinse until water runs clear to reduce starch. Use the rice cooker’s measuring cup and lines—most machines provide a rice:water guide. Typical white rice ratio is roughly 1 cup rice to 1–1.25 cups water in modern cookers; brown rice often needs more water and a brown setting.
Add salt and a little oil or butter if you like. Close lid and press the proper setting. Let cooker finish and then rest on ‘keep warm’ for 10–15 minutes before fluffing.
Avoid opening the lid during cooking. For flavor, cook rice in broth or add aromatics like garlic, bay leaf, or a strip of citrus zest.