How do you get Argent Dawn rep?

Excuse me, I'm a bit new to the world of Warcraft and I'm wondering, how exactly do you earn reputation with the Argent Dawn faction? Is there a specific questline I need to follow? Or are there certain activities or tasks that contribute to their favor? I'd love to know the most efficient way to increase my standing with them so I can access their rewards and benefits. Could you please elaborate on the process?