Question: People talk about Vedanta says this, Vedanta says that, what is Vedanta and who created it?
Answer: Vedanta does not refer to any book. It is the sumum bonum of the teachings enshrined in Vedas. Vedas are the truth realized by ancient Rishis. The mass of knowledge was classified by Vedavyasa into 4 Vedas Ð Rig, Yajur, Sama and Atharva.
You can read the book “Spiritual Heritage of India” by Swami Prabhavananda or any book on Indian Philosophy.