You should read the Power of Now. He does an excellent job explaining all of the concepts of consciousness.
Next, read this list of recommended books and videos:
Recommended Books and Videos on Consciousness Expansion
Then, read through these beginning articles:
Definitions
What Is Awareness?
Why Should I Do This?
Who am I?
Who Am I Not?
I’m Lost! Help!
Let’s Talk Meditation
What Are Psychedelics?
What is Manifesting: How to rewrite the code to your life
What is Anxiety? Do I Need To Be Worrying All The Time?
What is Letting Go?
Am I In Flow Or Not?