What seems like an overwhelming task at first will become quite straightforward once you have a proper setup and a bit of practice. Some die, because they were not fit to live, some die from stress and filth during shipping. Many die from malnutrition, cold, and ignorance. Most people who buy a pet want to take good care of it and give it their heart. But, unfortunately that doesn't help, if the information is wrong or non-existent.
Most turtles sold as such are baby red-eared sliders or other turtles from the same family.
These turtles reach an adult size between 7 and 14 and more inches, depending on gender. If your little turtle is green with orange cheeks, it is a red-eared slider. If it is green with a yellow belly with dark markings, it is most likely another slider-type turtle. These are the most common baby turtles sold. Do find out what kind of turtle you have, since every turtle has somewhat different needs and requirements.