1. Make sure that you're entering your payment details on a secure site. Try to find "https://" inside the URL of the site that you're seeking 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 with your account information.
2. Many online shopping sites offer discounts if you use a "promotion code". These codes are easily found online simply by entering the words "coupon code" along with the manufacturer or name of the website you will be buying from. They may offer a percentage off or free shipping by simply entering in a simple code which can be easily found by investing a few minutes searching for it.
3. Be skeptical of overdoing it. It is much easier to overspend if you are shopping online. You start to rationalize that you can spend more for those shoes because you saved money on gas and the food you would have gotten should you went to the mall, as an example. Give yourself a restriction and stick to it.
4. Do not spend too much funds on shipping. Shipping charges can definitely add up. Many sites offer free shipping, free shipping once you spend a certain amount, or have a coupon code that permits you to get free shipping. Instead of paying your hard earned money on shipping, look for a store that ships for free.
5. Be wary for any emails you receive, even if they appear to be from the retailer you trust. Never click on a link that directs you to a site other than usually the one you shopped on. Should you, you may become vulnerable to a gimmick. Rather than simply clicking an email hyperlink, just go up to your browser and enter in the web site you would like to go to. It is much safer that way.