A proper noun means that the noun is only one. =  names a specific person, place, thing, or idea and is always capitalized in English. For example,There are Africa,christmas, the olympic = Africa, Christmas and the Olympics are some examples.
And a common noun means general things. = a general, non-specific term for a person, place, thing, or idea.
For example, There are city, dog, music. =  A city, a dog and music are some examples.
In Egypt, the most enjoyable means of transportation is the felucca.
In USA, the most expensive means of transportation is the cable car.
In Japan, the fastest means of transportation is the bullet train
In Russia, the slowest means of transportation is the trolley bus.
In Italy, the most exciting means of transportation is the gondola.
In the Philippines, the cheapest means of transportation is the jeepney.
In Thailand , The = the safest means of transportation is the tuk-tuk.
In vietnam = Vietnam, the most comfortable means of transportation is the cyclo.

Please remember what a proper noun and a common noun is Yuri