Always check the size, nature, viability of a product, before purchasing it. Dimensions and quality differ from brand to brand.
Explore your options! You can get the same product or service in various websites. Sometimes you can get lucky with deals and ongoing discounts on some sites. You can save good amount of money with deals and coupons.
Before placing your order, check out reviews on the product, the delivery details, delivery costs etc.
Make sure you are aware of the website’s return policies and grievance policies.
Make online payments through verified payment systems. Don't share your card/account details over email.
Don't delete email confirmations and receipts – they're your proof of purchase.
Don't fall for low prices. There’s always a catch! Check website authenticity and terms and conditions.
If you have further doubts, call customer care. If websites don't have a proper customer care channel, it's not worth it!
Last but not least, check reviews in portals like Grahaq, and share your experiences as you write some yourself!