1. Do not forget to comparison shop when you are looking for things online. People usually do this when shopping in physical stores, but they don't think about it on the web. If you choose the first sale you see, there is a chance you are going to miss out on a much better deal elsewhere.
2. Always save copies of your orders and receipts from online purchases. Many stores will redirect you to a page after you've submitted a purchase detailing everything that was bought, customer information, the prices, etc. You should either print a copy of this or save a copy to your computer in case any issues arise before the end of the return period. Be sure to save any emails regarding your items' status or correspondence with the company regarding your orders, too.
3. Be careful in regards to the online stores that you consider buying from. If the web store is poorly designed, filled with misspellings, and overall fishy, you should take your money elsewhere. These are signs that something might not be right about this store. It's better to be safe than sorry.
4. If you like an online store, sign up for their email distribution list. You will probably receive some coupons and information about deals within your mailbox. Check these emails regularly to stay up to date with good deals and promotional offers. Most online stores often offer free freight or discounts on certain products.
5. Be wary of any emails you receive, even if they appear to be coming from a retailer you trust. Never click on a hyperlink that directs you to a web site other than the main one you shopped on. Should you, you may become vulnerable to a gimmick. Rather than simply clicking on an email hyperlink, just go as much as your browser and enter in the web site you need to go to. It is much safer that way.