All beings are multi-dimensional, including humans. Our problem is that we have forgotten our multi-dimensional nature and have been disconnected from much of ourselves. The variety of beings out there which you will become aware of through awakening your Third Eye and spiritual transformation is truly amazing. From nature spirits to angels to Extraterrestrials to huge beings maintaining the dimensions to the tiny beings in particles, there are beings everywhere. An explanation of the infinite variety of beings in existence is beyond the scope of any book as it is truly infinite. By awakening your spiritual senses you will inevitably become aware of many different beings and you will be able to communicate directly with them. The communication used is telepathic although sometimes you may actually hear words. Generally telepathy involves the transmission of feelings which the receiver can then put into words much like a translation. There will always be information lost in translation just like when trying to explain to someone an experience you have had. Can they ever really know how you felt by your description alone? Can you know the taste of a piece of fruit by a description? You may get some idea but you can never know until you taste it. Indeed even with friends, loved ones and others here on Earth, telepathic communication could rid the World of so many misunderstandings.
When communicating with beings in other dimensions it is sometimes a good idea to save the translation for later. While communicating simply use the means available and wait until the end to try to put things into words. Telepathy and inter-dimensional communication is based on feelings. The reason most cannot communicate in this way is that they are not in touch with their feelings.
There are some beings that are working with humans here on Earth who are helping with our spiritual transformation. These include guides, angels and Extraterrestrials. There are other beings that can and do interact with us but these are the main ones that you will be in contact with and who will be helping with your spiritual awakening. For this reason I will give a brief description of these three types of beings.