Using these OOLY Smooth Stix watercolor gel crayons is super easy. First, just twist up the crayon from the plastic barrel. Then start coloring or drawing on your paper. You can use the included paintbrush and dip it in water to add watercolor effects to your artwork. It's really fun! As for the things to note, keep the crayons away from very high temperatures as it might affect their quality. Also, make sure to keep the travel case closed when not in use to protect the crayons. For maintenance, if the paintbrush gets dirty, you can wash it with clean water and let it dry. And if you accidentally get the crayon on your hands, just wash it off with water since it's water - soluble. Have a great time creating art with these crayons!