As Spirit, you can choose to move your consciousness from your physical body and locate it in your astral body. Basically there are seven levels of the astral, and each layer has a frequency that corresponds with the seven energy centers in a manifest body. There are parallels between the energy centers in the body and the cosmos. Each level encompasses all the levels before it. Depending on your state of being in body, you can access different levels of the astral. For example, if someone is in a state of absolute survival in body, when they are out-of-body on the astral, they will be limited to the first level of the astral. This realm has to do with survival issues, not only for the body, but also with respect to survival in general. So the beings one would meet on the first level of the astral will also be in a similar survival state. So there will be a number of survival-based Energetic Houses, multiple survival-based versions of heaven, for example, and many other realities that vibrate at the frequency of survival present on the first layer of the astral.
The second level of the astral, like the second chakra, has to do with emotionality, sexuality, and clear feeling. The energy in this realm resonates or vibrates at a quality of emotionality. All the beings here are essentially operating in loops of emotions, sexuality and clear feeling. The third level of the astral has a different vibration, having to do with power. The frequency of the fourth is love, in that sense of affinity. Communication starts to be the predominant energy set at the fifth level of the astral. The beings capable of raising their energy vibration to a point where they are perceiving reality from a clear clairvoyant state will be present on the sixth layer of the astral. Only beings that have a clear Source cord, which creates high levels of knowingness, can vibrate at a high enough frequency to access the seventh level of the astral.
As you move forward on your path, and become more powerful spiritually, you will be able to access higher and higher levels on the astral. You can play with getting more and more at ease with accessing all the levels, right through the seventh. The level of the astral within which you spend most of your time correlates to the level of energy you run on a regular basis while you are in body. For example, if you primarily live your life based on power, your third chakra, the first three layers of the astral will be where you spend your time while astral traveling. You will be drawn to a certain place, on the astral, where you have relationships with certain beings that need to be addressed.
These relationships are, of course, as real as they are in-body. Some of the beings you meet on the astral have physical bodies and some do not. You have to truly own each level before you will be able to raise your vibration enough to access the next. The intent is not to be limited by any of them but to have freedom to go to any astral level you choose.