Basic
Nen
Within the body there is a network which channels nen from within body outward through nodes. The nature of aura is empathic. It is effected by all things and is subject to change.
Ten
The first of the basics techniques which makes vital benefits possible. The technique itself is no more then containing ones nen so it envelops the body. Having a shroud of aura surround the body is the most basic defense against the physical or psychic attacks from other users of Nen. Ten adds other benefits such as reduced aging and accelerated healing.
Zetsu
While Ten allows a user to keep aura from leaking away from their body, Zetsu stops the flow of aura from their body altogether. By closing all of their aura nodes, the user is able to stop almost all outflow of their aura. Because the user is no longer surrounded by their own aura, they can become more sensitive to the aura of others. This can be useful when being tracking another person. Even a weak attack enhanced with aura could do massive damage when using Zetsu. Ten benefits of Ten are also lost.
Ren
Ren is a direct application of Ten. Since a user is capable of keeping aura from leaking away from the body, it's also possible for them to produce more aura around them without having to worry about losing it. Ren focuses on outputting a high amount of aura and keeping it on the body, expanding the size and intensity of it. This increases the user's physical strength and durability and provides a large pool of aura for any advanced techniques or individual skills they decide to use.
Hatsu
Hatsu is the release of one's aura so it can be projected to carry out a certain function. In essence, the Hatsu is a special and unique ability that one creates. A good Hatsu should reflect a person's own character; one can never truly master Nen if they only copy other people's abilities. Hatsu has six different categories, and the aura of every individual is aligned with a specific category. Upon learning their affinity, one can set about learning to apply Nen in a unique way that suits their personality, which can develop into a unique skill. A person may also have the ability to use more than one Nen ability, but they may never be able to change their Hatsu type. For example, Gon's Hatsu is enhancement, but he is also capable of using emission and transmutation through his Jajanken technique. However, even though a user may be able to use more than one Hatsu, they can only be adequate at the Hatsu adjacent to his primary Hatsu. So although Gon can use emission and transmutation adequately, he will not be able to use manipulation or conjuration very well or at all.
((For more on hatsu, look into 'hatsu in depth' and 'Pledge and Limitations'))
