Welcome to Android Central! Open the Camera app, go to its settings, and look for an option to change the default save location for the photos--you can usually choose between Internal Storage and microSD card. Photos will save to the /DCIM/Camera directory on either location, and those photos are automatically added to the Gallery app's database. (The Gallery app isn't a location--it displays all images stored anywhere on the phone, as long as there isn't a file called ".nomedia" present in the directory.)