The Eighteen Dhatus
This is the ALL
The eye and visible objects visual consciousness
The ear and sounds sound consciousness
The nose and odours smell consciousness
The tongue and tastes taste consciousness
The body and tangible objects touch consciousness
The mind and objects of mind mental consciousness
This is all there is, past, present and future. There is nothing other than this.
The Five Skandhas (five bundles that together consitute a human being)
The body (including the external senses and their objects – that is the physical world)
Feeling
Perception
Mental Formations
Consciousness
Each of these has consciousness: body consciousness, feeling consciousness, perception consciousness, mental formations consciousness and consciousness of consciousness.
To fully understand all this each element needs to be understood and understanding means the extinction in every element of desire/greed, aversion/loathing/hate/anger, and delusion/ignorance/not seeing and not accepting life as it really is.
All these are impermanent, continually changing as described in the article on impermanence – the flow of consciousness.
This requires special training and practice which takes most of us a long time, if we undertake it at all.