An area of concern when purchasing online is entering your credit card information and clicking send. Who knows where it goes or who may see it. Purchasing online with a credit card is a secure method of payment. When the website asks you for your payment information look at the URL (That is the website addres, ex. http://www.memoryfoamslipper.com). If it starts out https that means the website will encrypt your information. This will ensure that no one can intercept your credit card info.
When you make a purchase online, always use a credit card. With a credit card you can dispute the charges if the seller tries to scam you. This will allow you to reverse the fradulent charge.
The last piece of advice is to purchase from a reputable online company. Companies such as; Amazon, Overstock, BestBuy, and Walmart. When you purchase from well known and reputable companies you will not be scammed.