Use the search feature on the Beyond dreaming forum with the terms “astral” or “projection”. There are tons of posts about this, for instance:
Lucidity and AP?
Astral travel or Lucid Dreams?
Astral projection - Just another form of LD’ing?
As this has been discussed many times, and the “Lucidity and AP?” thread, which is about the same question you asked, is rather recent, I’ll lock this topic.
Topic locked