This is the 924th most frequent German word.
dir
The word "dir" in German is the dative case of "du" (you), meaning "to you" or "for you" (informal).
Here, 'dir' is the dative pronoun for 'you', acting as the indirect object of the verb 'gebe' (to give).
Ich gebe dir das Buch.
I am giving you the book.
Here, 'dir' is again the dative pronoun for 'you', functioning as the receiver of the action in the context of the verb 'erzählen' (to tell).
Hat sie dir davon erzählt?
Did she tell you about it?
In this case, 'dir' is the dative pronoun for 'you', which is used here with the verb 'helfen' (to help) because it always takes a dative object.