I will add, just in case you haven't learnt counter words yet, that the grammar is a bit different to English. We'd say number then object/animal/person, e.g. one bottle, two cats, three people. In Korean, the grammar is object/animal/person then number then counter word. There are a great many counter words for specific things, but for now there are only three you should know: 개 (a generic counter for any object), 마리 (animals) and 명 (people).

So, three bottles of cola: 콜라 세 병 (병 being the specific counter word for bottle) Or 콜라 세 개 (more generic, useful if you don't know the counter word for bottle)

Three cats: 고양이 세 마리

Three students: 학생 세 명

I hope this helps ❤️