I think anything you own and could sell would be considered an asset. How much you want to track is up to you. I keep a spreadsheet of my investment accounts, but I don't include anything else. Mentally I have a rough estimate of what my cars, house, pinball machines, collectibles, etc. are worth, but I don't track them. At one point I had 300 of those stupid Funko Pop figures. Keeping track of the value of all of those would be a nightmare.