Online Shopping Safety Help?

Hey, Is online shopping safe? It's like my father's friend ordered two apple IPhone and what he actually got in his delivery was two apples!That was kinda funny and I started laughing but he was sad! But I now scared to do online shopping! Have you ever done online shopping? Do you think its safe? Can you list some websites you have shopped from like amazon etc.?Any bad experience with you related to online shopping. Thanks in advance!