If you’re tying it, you’ll be buying it here on The Knot. This site provides comprehensive wedding “content,” that is, information about all aspects of wedding planning. Avoid faux pas with advice about how to pop the question or where to seat your father-in-law’s first two wives. Research ethnic and religious wedding traditions, too. It lists local wedding services and offers a wedding budgeter and checklist. This is also a great place to order wedding favors. Download the free wedding planning app for iPhone: Wedding 911 (itunes.apple.com/us/app/wedding-911-by-the-knot/id321839274?mt=8).