Hanging posters from wall
Yes, binder clips are a great solution. You can put a tiny tack or pin to hang each clip on directly, without using string. If this is "real" paper artwork (like a drawing, print or silkscreen), put a small piece of archival paper, or any good-quality paper, between the clip and the artwork to protect the art from rust or the clip if the air is damp. The front wire of the binder clip can be compressed and it will pop off easily, making a nice clean look. Good luck!