Hey Sezgin,
welcome to Wikidata! It is great to have new contributors. I assume you speak Turkish, and maybe other languages? Then working on labels in your language will be an awesome help. Be sure to set up your User page with a Babel infobox where you set your languages - it will make it easier for you to contribute labels to Wikidata while you surf it. (If you don't know how, ask)
Yes, you are completely right with regards to the Label for Zara, Turkey. It should just be Zara, and the description probably "city in Turkey". Just go ahead and change it (if no one else did that already).
Descriptions can and are often automatically generated, by bots and then added to Wikidata. If you are good at creating descriptions, and maybe writing bots, you are very welcome to do so and then go to Wikidata to ask for permission to run the bot. More descriptions would be awesome!
Thank you for joining Wikidata, I am looking forward to see the project grow with your help.
Cheers,
Denny