Friends must be trustworthy and in the same situation, so that when they are delirious and unable to take care of themselves, they can entrust their own affairs.
Residential areas should choose places with elegant environment, high quality people around them and perfect property management.
Notarize one's own property, make a will and hand it over to a third party for execution.
Of course, the premise of all this is to save money as much as possible, because the premise of all plans is to have money.