To understand what are ghost, spirits, faerie, angel... we must first be aware of other worlds and dimensions exist all around us, every minute of every day.
Physical universe that we know of are subject to the physical laws governing this dimension. Higher dimensions planes are more fluid and variable in the extreme.
All nonphysical beings vibrating at a highter frequency than the known physical universe. This makes them invisible and undetectable to the normal 5 senses and to all scientific means available today. just as different types of energies-light, gravity, x-ray, heat, microwave,etc.-occupy the same space at the same time in the normal physical universe without interfering with each other to any great extent, so do these different dimensional levels coexist in the same space at the same time.
You can read more of these dimension beings in the book "Astral Dynamics" by Robert Bruce. In it he share his own record of out-of-body experiences how he communicate with them and projection techniques he used...
I learned frm many master.
It best to have some spiritual practise before you due with any nonphysical beings.

Meditation which is an art of quieting the inner noise in the mind help to broaden your sense of self and realize that you are more than your physical body. This should be the base of any spiritual work.
I learn to programe symbols for various task frm ReikiTummo. They have technique to awaken the kundalini and activate your chakras.
