Assets are the sum of all the money available to you. It is used a lot in this sense on a daily basis, so it will not be very strange. It is an asset if you mobilize everything that can be converted into money other than real money, such as the balance in your bankbook, real estate or jeon tax, monthly rent, car, motorcycle, laptop, etc.
It's a bit different, but... Then are health, ability, and youth an asset? I think it can be viewed as an asset. Although it is slightly different from general household management, these can also be managed by quantifying them as assets in terms of self-development. Conversely, if nobody needs to manage real estate, which is an asset, it can be excluded from an asset. In other words, it is up to the user's individual judgment to the extent to which it is taken as an asset.
Assets increase or decrease due to several factors. Usually, when you get a loan (increase in debt) or when you get paid (income), your assets increase. Conversely, paying off a loan or buying something (incurring costs) reduces your assets.