What is the best beginner motorcycle, but yet sporty looking?

I want to ride a motorcycle but don't know much about them. I here people talk about 700's and 600's and I am like "what!?!". SO someone let me know the best one for a beginner and what exactly is a 600 -700 -1000?
Update: I plan on riding every now and then in town. I will probably be on the highway with it too for about 30 minutes a day
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