What does this mark on the camera lens mean and how to coordinate it when taking pictures?

AF/MF, automatic/manual conversion. The above is the focal length range setting, full, which is the entire focal length and can be adjusted freely.

0.5~infinity means that the closest shooting distance is 0.5m and the farthest is infinity; 0.3~0.5m means the shooting distance is between 0.3~0.5m, which is generally regarded as macro photography