An inventory of your household items and belongings is very important when it comes to homeowner's insurance. If you have to make a claim for stolen or damaged property you will be required to show proof that you did indeed own such an item or items. You'll be asked to give copies of receipts or other documents to support your claims.
This can be a laborious task, but it's best to go room by room and take notes and photos of all your belongings. Write down the Brand Name, Manufacturer, Model Numbers, Serial Numbers etc. Label photos correctly and date stamp them. Don't forget to keep the inventory in a safe place, such as a deposit box.
Also, make sure you give good written descriptions about your belongings, and don't forget items outside in your yard, shed, or outbuildings.