What's the difference between Holka and Děvče?!
Perhaps there are more, but Google immediately showed this one.
What about the gender? Why holka is categorised as feminine while děvče is neuter?
There is rarely logic in grammatical genders. Why is člověk (human) masculine and osoba (person) feminine? Some historical reasons are behind that.
how the girl can be new?
new to the party, company, school...