1. Be skeptical of overdoing it. It is much easier to overspend if you are shopping online. You begin to rationalize that you can spend more for those shoes because you saved money on gas and the food you would have gotten if you went to the mall, for example. Give yourself a restriction and stay with it.
2. Be sure that you're entering your payment details on a secure site. Search for "https://" in the URL in the site that you're attempting to buy something from. If you don't see that or no sign of any website security, then it's probably a good idea not to trust those people along with your account information.
3. When you are shopping on the web, you should only shop at reputable stores. If the store does not have a good reputation, you may be requesting trouble. Some people have had their credit card and personal information stolen from shopping on lower than reputable websites. Be careful and protect your private information.
4. Look for the right times to shop online. Often the stores that you frequent will have online sales that follow a time pattern. Many, for instance, schedule sales for the beginning of the month or at the end. If you see there's a pattern, hold off on buying anything until the upcoming sales period begins.
5. Shop around when you shop online. You will probably find that prices for certain items can vary greatly from one store to another. To be sure you get the best deal, look at some different stores to learn their prices, as well as shipping charge. This will allow you to get the best deal you are able to.