This is the 51st most frequent Italian word.
oggi
"Today."
In this sentence, 'oggi' is used to indicate 'today,' specifying that the action of going to the park is taking place on the current day.
Oggi andremo al parco.
Today we will go to the park.
In this case, 'oggi' emphasizes the specific day being referred to, i.e., there is a direct request for assistance within the current day's time.
Hai tempo oggi per aiutarmi con il progetto?
Do you have time today to help me with the project?
Here, 'oggi' in the phrase 'oggi come oggi' is an idiomatic expression meaning 'nowadays,' referring to the current era or time.