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If you have hundreds or thousands of photos to scan, having an auto-feed scanner is going to save you a lot of time.   Once your scanner is turned on and connected to your computer, you can follow instructions and feed one photo after another into the scanner without pausing in between images. If choosing this option, it helps to put your photos in order ahead of time. Images will be stored in the order they are scanned, so taking some time to arrange them ahead of time will save you more time once the scanning is done. This way you can individually adjust settings for each photo, if you want. These scanners usually have automatic edge detection capabilities   Lay up to 4 photos on the scanner glass at a time to scan. Most scanners will have a button you can press to indicate the photos are ready to be scanned. Press this button and watch your images get uploaded to your computer! 300 is a minimum and 600 DPI will provide enough pixels to enlarge the photo but also maintain quality. This is a great trick so you can make larger prints of photos in the future! Use the cleaner along with a lint-free or microfiber cloth for the best results. Make sure the glass is completely dry before scanning photos.
Choose an auto-feed scanner for a large quantity of photos. Choose a flat-bed scanner if you are concerned with optimal quality. Use a DPI (dots per inch) between 300 and 600. Use glass cleaner to prevent smudges on your scanned photos.