1. Although it might appear tedious, be sure you read the contract and terms before you purchase with a website. These documents have valuable information about what you can and cannot do when you have a problem with the item that you bought. Read them thoroughly so that you do not have an unwelcome surprise when trying to come back items.
2. While shopping online, be certain the site you are on starts off with "https". The "S" means that the site is secure, which entails that you could safely enter your personal information without having to concern yourself with identity theft. When a site lacks the "S" in it, you may want to avoid using it.
3. If you want to buy books online, you'll get a better deal if you get them used. Depending on the condition you receive them in, you may just end up paying a few cents plus shipping. Make sure you go through the description of the book to see if you can find any damages you should be aware of.
4. If you're purchasing clothes or shoes online, be careful with all the sizing. Some items typically run smaller or larger than normal. Some shopping sites will advertise if an item runs true to size. If the site doesn't list anything about sizing, glance at the reviews. In most cases, if the item is running larger or smaller, the reviewers will let you know.