Look at any experience as it arises, whether it's an "internal" sensation, feeling, or thought, or an "external" object. Just look into it, and recognize it as a sensation, feeling, thought, or perception.
Then look at what is aware of that experience. Just look into the awareness, recognizing it as awareness.
Try going back and forth, from the experience to the awareness, back and forth, with curiosity, to know clearly the nature of experience and awareness.