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If you are talking about a computer, you need to specify what operating system you use. You can't just assume that everybody knows what you are talking about. I assume you mean Windows because I don't know anything about other systems. Go to your desktop and click on Trashcan. Right click on the photo in question and click on Restore.
Every program you use has a tools menu. If you use tools a lot it will be a toolbar across the top of the screen. If you rarely use tools it might be hidden. In Windows you can click "Start" and select "Control Panel" and that gives you a menu of menus to control everything the computer does. You can right click anything and most of the time get a menu for that specific item. For example if you right click the desktop you have the option to change resolution or rotate the monitor image in some graphic cards. That allows you to have an image that is high instead of wide, by turning your monitor. You don't need to memorize all these things, just be aware that they are in there. Then you can claim to know how to operate a computer at the beginner level.
Check in occasionally at www.howtogeek.com/ to see if there is anything new that you need to learn.