One of the challenges of learning about meditation and higher states of consciousness is the plethora of sources to study. There is a lot of misinformation and well intentioned teachers who are lacking in this area. The old saying that the wise should not delude the ignorant should be born in mind.
If you are going to take up the philosophy behind any teaching it is good to thoroughly study it. There are two aspects in learning that are critical, the powers of discrimination and discernment. By reading what the great Masters of the different traditions teach and say we begin to build an understanding of "right" knowledge. This enables us to determine quality and truth from that which is not.
In the Gita Krishna, who represents God and Arjuna, who represents mankind have a discussion. This is the basis of the Gita, and Krishna begins by discussing the value of Knowledge, then he gets into a conversation about Experience. Krishna teaches that you must have both Knowledge and Experience to become the truly Enlightened person.
Each tradition has a core teaching that is in common with others. In some you have to dig a little deeper to find it. For example in Christianity delving into the writings of the Saints like Saint John of the Cross or St. Teresa of Avial bring forth mystical thought and experience of that tradition in a highly illuminating way.