The 5 khandhas are:
4. Mental formations
Your experiences are your reality. Not somebody else's experience; your experience. Reality is moments of these experiences. These experiences are made up of the 5 khandhas. Every experience has a form, a feeling, a perception, a mental formation, and a consciousness. Because experience is arising and passing away every moment (impermanent), not satisfying, and uncontrollable we can see that none of these khandhas individually or as a group is a self. Because we don't truly understand this we get attached to the idea that there is a self in the khandhas.