This is the 35th most frequent Danish word.
du
"You" (singular, informal).
In this sentence, 'du' is used as a subject pronoun to address someone informally in the second person singular.
Hvordan har du det?
How are you?
Here, 'du' is again a subject pronoun in the second person singular, confirming its role in identifying the main subject in an informal question.
Kan jeg hjælpe dig, eller klarer du det selv?
Can I help you, or will you manage it yourself?
In this sentence, 'du' is used informally as a subject pronoun in the second person singular to refer to the addressed person directly.