1. Make sure that you're entering your payment details on a good site. Look for "https://" in the URL of the site that you're attempting to buy something from. If you don't see that or no indication of any website security, then it's probably a wise idea not to trust those people along with your account information.
2. Whenever you enjoy the convenience of frequent online shopping, it's very important to keep changing the passwords you use for each account. Every couple of weeks approximately, make up a whole new password for your bank and the shopping sites directly. Use abstract words, combined with numbers and other odd characters for your strongest passwords.
3. When you shop online, make sure the site you happen to be on starts with "https". The "S" implies that the site is secure, which entails that one could safely enter your personal information without having to concern yourself with identity theft. In case a site lacks the "S" in it, you may want to avoid using it.
5. Many online shopping sites offer discounts if you use a "discount code". These codes can be found online simply by entering the words "coupon code" along with the manufacturer or name of the website you will be buying from. They might offer a percentage off or free shipping simply by entering in a simple code which can be easily found by investing a few minutes trying to find it.