This video really does cover the absolute basics of importing and handling pictures inside iPhoto. A tutorial aimed at absolute beginners. One thing I would say is forget those habits from using Windows! Don't go rooting around in your pictures folder if you are looking for a photo. Use iPhoto for emailing, exporting pictures to disk everything If you really want to get your hands on the actual file itself.
- Highlight the picture that you want and then choose File>Export.