hajjid Asked: What are the differences between theta meditation and normal meditation?

Hi I am a newbie to meditations, but so far I have tried a few. Recently I have come across these theta binaulary beats and have noticed that it brings me to deeper meditative state and even faster than the regular observe your breath meditation however I still do apply this technique of breath observation while listening to the beats anyway so it is very similar but it just works quicker. So please fellow meditatiors can you give me some extra info on this.

Actualy the reason I got to this was because I really want to try astral projection and have read that it can be achieved through meditation, specificaly when you reach the theta state (which you can reach even without the binaulary sounds,but probably with years of experience) so I tried meditating tonight but nothing happened :/ I mean no AP but still it was nice meditation, perhaps I should lean towards the other technique lying in the bed and wake up after falling asleep (sleep paralysis)

1. What do you think is the best for Astral Projection -normal med,theta sounds med, or lying in the bed

2.Which meditation should I keep on practising in general -normal med, or sound guided med

thanks for your opinions