Precaution in using washing machine and microwave oven

The main precaution with using a microwave oven is to never put metal in it. Beside ruining the oven, it is an extreme safety and fire hazard. Other than that timing of cooking dishes is much more critical than with other means of cooking. Hopefully you got some kind of guide with the oven that gives suggestions for cooking times and what can be cooked in microwaves. Some food items, like frozen dinners, come with suggestions for cooking in a microwave. With a washing machine it is important to follow directions and be sure the electrical and plumbing connections are done properly and safely.