All smartphone makers, not just Apple, are focusing on the development of "cameras". Competition is not limited to the performance of lenses and image sensors, but also correction functions that utilize AI/machine learning. As a result, anyone can easily take beautiful photos, and the number of shots is increasing.
However, as the number of pixels increases and the number of shots increases, so does the amount of storage consumed. In the case of iPhone, there is no way to transfer to a microSD card, so there is no choice but to import it to a computer or copy it to a cloud area such as iCloud.
If you delete the photos that have been copied, the storage space will be restored, but the problem is how to select the deletion target. It would be easy if you could target your entire photo library, but things get complicated when you have photos that you want to keep for viewing.
The most orthodox method is to choose by time axis. On the "Library" tab of the photo app, the photos in the photo library are arranged in order of shooting date, so scroll up and down the screen and select the target to be deleted. Photos are taken collectively at the time of the event, and if you can specify the shooting time, the selection of photos will progress.
Another way is to choose by spatial axis (location). Events that you want to keep in photos, such as travel, are closely related to a specific space/region, so you can select photos to be deleted while looking at the map.
The procedure is simple, display a suitable photo and flick it upward, tap "Surrounding photos" in the upper right of the shooting location field that appears, and select the photo to be deleted by operating the map that appears. OK. It is assumed that you have taken photos with location information, but you can efficiently find photos that you can delete, such as burst photos taken during family trips, sports festivals, camping and picnics, but they are duplicated. I will.