When approaching and talking to a girl for the first time, does body language, eye contact, and smiling really mean anything?

Anonymous
I keep hearing that when you talk to a girl for the first time, you should pay attention to whether she is fully facing you, makes a lot of eye contact ( doesn't look around and having your attention ), and if she genuinely smiles at you. Is this done to be polite?

Do these thing really matter as much as people say?
When approaching and talking to a girl for the first time, does body language, eye contact, and smiling really mean anything?
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