What does "good morning" mean?

Background introduction:

A more formal statement is generally "good morning to you." In order to express it simply and conveniently, and to be less formal, we simply use "good morning" to greet and greet. Or just use "morning". It's like saying "Good morning!" In spoken Chinese. Instead of saying, "Have a nice morning!" .

Morning English [? m？ : n] beautiful [? m？ : rn]: in the morning; In the morning; Dawn; Early stage;

[example] in? Good morning. Your guide will show you around. city

The guide will show you around the city in the morning.