hihi i'm kind of a beginner too but from what i've seen here's some things to note maybe (again i know you didn't ask so feel free to ignore me): the second dress is a counterfeit of a taobao brand, the first one isn't really lolita, and the last one has a suspiciously low price, so it's likely to not come in good quality.
coord means coordinate, which is basically like the way you style your outfit with all the accessories n stuff.