Microwaves are used quite frequently in most kitchens! And for a lot of people, they don’t use a number of the buttons that are on it.
The one button that should be used more is the “cook power” button. Cooking things on full power is not always best. Think about your oven, you’d never do that with everything you put in there, so why do it in the microwave? Lower power for longer helps things cook more evenly and saves you from the warm outside, and cold inside that can easily happen. Especially when it comes to cooking something that was frozen. This will add time to your cooking but is definitely worth it.
Source.