There are Two Realms of Heaven + Earth in Taoist Studies
The philosophical concept of Heaven and Earth encompasses many practices of both the manifest and primordial realms. As a qi gong practice, Heaven and Earth is an excellent methodology for penetrating deep into the body and bringing alive the many layers of flesh, fluids and qi; whereas, Heaven and Earth as a fundamental aspect of Taoist theory enters the realm of the cosmic, having very different implications.
This dual-aspected philosophy is not unique to Taoism, as discussed in the article from which this excerpt is derived, but the pragmatic and skilful approach of the Water method allows the Taoist seeker to evolve on all levels of their being through a systematic training protocol. Derived from study of the Five Elements and I Ching, this practice methodology offers the dedicated student of the Tao effective strategies for navigating the pitfalls of living in the modern material world, and effectively growing their personal and spiritual potential.
Taoism encompasses a wide range of practices from martial and healing arts, to yoga and meditation, to poetry, painting, calligraphy and geomancy, as well as methods for working with the Five Elements. All of them are ultimately contained within the teachings of the I Ching (Book of Changes). Although throughout the ages some Taoists have studied all aspects of Taoism, most certainly do not. Instead, each individual attunes to their path to what is relevant to their personal and spiritual development. That said there are core techniques which all Taoists train. They can be classified in three categories: the 16 nei gong, Five Element practices and I Ching arts.