Using this tumbler is super easy. Just open the lid, pour in your drink - hot or cold - and close the lid tightly. When carrying it around, make sure the lid is properly secured to prevent spills. If the cup is filled with hot water, be aware that steam may lift the lid, but it's normal. For maintenance, wash the tumbler with mild soap and warm water after each use. Avoid using abrasive cleaners as they may scratch the surface. And dry it thoroughly before storing to keep it in great condition.