First things first let's get the basic terminology covered so you can navigate with ease
Chakras (pronounced "chaa-kruh")
These are energy vortexes within the body that are connected to massive nerve endings. Not only do they correspond with various organs as well as our psychological, emotional, and spiritual states of being. There are numerous chakra points in the body but the 7 main ones which are aligned from the base of the spine to the crown of the head. It is essential that our chakras stay open, aligned, and fluid. If there is a blockage, energy cannot flow & will thus reflect in areas of our life journey.
Reiki (pronounced "rei-kee")
An energy healing modality that utilizes the Universal life force energy to promote the healing of all physical, emotional, and spiritual elements. Reiki always works for the highest good of everyone involved. It is never over or under dosed and cannot harm in any way. Reiki is not magic. It works with the laws of quantum physics that everything in material and non material existence is composed of vibrating energy. The human body is born equipped with everything it needs to heal itself. While going through the battlefield of life, we encounter things that lower our vibrations and weaken these abilities. Reiki then comes in to strengthen and boost the innate healing system that has been compromised. It boosts the energy available for use by the body's natural born healing system. Reiki works to restore the balance of the energetic vortexes in the body.
Other terms to know:
Alchemy - ancient practice of chemistry that deals with matter and its transformations
Metaphysics - referring to an idea, doctrine, or posited reality outside of human sense perception.
Divination - the process of seeking knowledge from the spiritual realm