How to use 早上，上午，中午，下午，晚上

In daily life, there is no difference between 早上 and上午. They are usually interchangeable and equal to morning in English. However, if you want to describe an earlier time, 早上 is usually used.
中午 is noon in English,about 12-13 at the noon.
下午 is afternoon in English.
晚上 is evening in English, not night.

Hello beoucich,
about this question, here is the link for the explanation..
https://www.cchatty.com/100632

早上is like for early morning
上午for morning
中午for the midday ..middle of the day..
下午is said to talk about the evening
and 晚上is used to talk about the night
we say, “早上好“ which means “good morning“.. and “晚上好“ for “good night“， but if you wanna say ''good night'' to SLEEP, we say “晚安“（wan an）..
hope you anderstood:)