The basis of astral projection...

Inquiring minds would like to know. What is the basis of astral projection? How can I experiment with astral projection? Most importantly, is there any credibility whatsoever to this kind of thing? What kinds of results can you expect during "projection" I've searched the web but sorting through all the junk on this type of thing can be difficult. Looking for info with truth to it. Thanks.

If you tried Google already, try Wikipedia.org