Cleanup principle

I have this app called avast cleanup, and I think it's fantastic, so simple to use and takes the stress away from having to go through your whole phone just to find deletable data. If only avast had a maid service to do the same for my home! Technically it's so simple because the principle is the same universally. What takes up most space? What haven't you used in a long while? What takes up little space and haven't used in a while? Can you archive it or dump it? ........Avast cleanup my house!
End