Basking area platform choices are very important because your dragon will spend most of its day lounging on it. You should always use a cave, rock, log etc that is made for reptiles and therefor is made to withstand high heat. I suggest natural smooth stone or store bought cages like ZooMed's or ExoTerra's as they are made to be reptile safe. Be aware though with wood basking choices you will have to replace them often as basking platforms get pooped on frequently and due to wood being porous it will hold onto germs over time. As for flooring choices the page on substrate.
Food and water dishes should be chosen with care and not just grabbed out of a cabinet at home. You need a reptile safe bowls that can stand up to heat and will not break easily. Glass and cheap plastic are very bad idea for food and water dishes. Always make sure your dishes are shallow to prevent babies from drowning.
It is understandable that dragon owners want cool decorations for their enclosures. They want their dragon to feel at home as well as wanting to have the cage be aesthetically pleasing. When choosing additional decor make sure that it can withstand high heat if kicked into the basking area, make sure pieces will not break off if bitten causing choking and make sure that there is nothing with sharp edges that can cut your dragon. Also try to avoid decorations that have too many small spaces as feeder bugs will hide away in them.
Plastic and cloth craft flowers are very dangerous for dragons. Ingesting the glitter or small gems can be fatal as well as the cloth and thin plastic. These may look pretty but they are not intended for high heat and being bit by a dragon that may think they are food. Small rocks/pebbles are deadly to a dragon if eaten and should never be in a cage under any circumstances. Large natural rocks can have sharp edges which can cause injury to your dragon and some can become very hot, choose them with care. Fish tank decor can be ok in a dragon cage under 1 circumstance: IT REMAINS ON THE COOL SIDE ONLY and never sits under the heat light. Almost all fish tank decorations are made with resin, which is not meant for high heat and will burn your dragon and in some cases can release toxic fumes under high heat. Glass should NEVER be used in a dragon enclosure ever it will over heat and burn them and it can also get small cracks trapping germs. Toys of any kind should never be placed in a dragons enclosure on a permanent basis. The paint and plastic can chip and be eaten which will be fatal to your dragon. And these toys are not intended for high heat and can burn your dragon as well.