There are many different classifications of dragons. The most common way to classify the breeds of dragons is by the colour of its scales. Therefore we can find red and green dragons, blue, white, gold, black, brown and many other colours. Another classification is to tie them into the elements of where they
live. The most common elemental dragons are the water dragons, the earth dragons, the sky dragons and the fire dragons.
An apparently easy classification could be: good dragons and bad dragons, but in fact, it should be the most complicated, because we would have to establish a moral code for dragons, and we are afraid that it surpasses the possibilities of human moralists..
 
There are two main dragon families: Oriental and western dragons.
 
Western dragons are usually portrayed as evil, mean, and bloodthirsty creatures. Most dragons have the ability to fly, although not always take advantage of it. His membranous wings propel him through the air, and allow him to maneuver. 
Wester Dragon has long been considered an evil, maiden-stealing, village destroying, fire-breathing beast. He has many magical abilities including control over the elements, telekinesis, telepathy, shape-shifting, chameleon qualities, and invisibility.
Western dragons were particularly popular during the Middle Ages as knights would seek fame and fortune by attempting to kill the creature. The fame would come from the 'bravery' involved in fighting the dragon, the fortune was from the dragon's den as these creatures were said to hoard gold and jewels
 

 

Oriental Dragons: There is a great variety of oriental dragons. Chinese dragons are the most known of all of them, and can be identified by their long moustache and because they have  4 claws.
Japanese dragons are very similar in appearance to Chinese dragons, however they have only three claws and their body is more serpent-like.

Despite their lack of wing-like appendages, oriental dragons are skilled at flying.They use the flow of air in order to ascend and descend. It is said to have the head of a camel surmounted by two sharp horns, and the capacity to transform themselves into innumerable forms, including human forms.

In addition to being guardians of treasures, oriental dragons are strongly associated with water, being

the rain deity.