1. Always remember your finances and credit limits when you shop online. The virtual world of online shopping has gotten a lot of people in serious debt. You need to look at online shopping in the same manner you look at offline shopping. Never buy items online that you don't have the cash to pay for.
2. Once you enjoy the convenience of frequent internet shopping, it's extremely important to keep changing the passwords you use for every account. Every couple of weeks or so, make up a whole new password for your bank as well as the shopping sites directly. Use abstract words, combined with numbers and other odd characters for your strongest passwords.
3. If you have questions while shopping, search for a live chat function around the online store. Many big brands (and even some boutique stores) now have this functionality. It is possible to chat immediately with a customer service representative to correct any issues or answer any questions before you purchase. That can give you a lot of reassurance.
4. Read customer testimonials before you buy anything. People are delighted to complain about bad service online, so search for sites and testimonials that are terrible so you are aware what you're getting into. You should take bad reviews having a grain of salt, but if you see many, you know there exists a problem.
5. When you are searching for a place to buy a product and none of the results are most often from familiar retailers, you need to be hesitant about entering your data. Look for security signs from Verisign or Cybertrust, so that you know the retailer is not out to take your cash.