Adwaita Vedanta says, it's not a question of going anywhere to this Lokha or that Lokha. Realize your Brahman here and now and be free: That's what the teaching will be. Vaishnava has a very well developed categorization of different kinds of heaven and different kinds of liberation.
Swami Sarvapriyananda teaches the Katha Upanishad, which is one of the most popular Upanishads. The scripture concerns the story of a young man who goes to the house of death to find out what happens after death. The reply describes the nature of reality and the meaning of life.