Of Nen

Aura

Energy/ life force that comes out from the body. it flows out through the 'shokos' of the body. Even if the shokos are shut, aura flows minimumly. If someone has an evil intention and uses his aura, it can harm other people and even break their bodies.

Shoko

They are the openings in which the Aura can flows through. One must learn how to control the shoko (whether to open it or shut) or else the aura may just keep going out, till your body has no life force anymore

Nen

The process/ technique to control oneself's Aura. It comprises of 4 elements: Ten, Setsu, Ren and Hatsu

Ten

This will increase the body strength. It can also make your body's aging process slower. It can be ascribed like forming a barrier to your body

Setsu

Sealing off all the shoko, this will shut 'Ten'. It is also used to heal, or to recover from exhaustion. This is also used to hide one's aura from the opponent, so that sh s/he can't easily be detected.

Ren

The process of a more powerful release of aura from your body

Hatsu

Utilization/ application of aura, like transferring the aura to an object.

Hin

Advanced Setsu, a more powerful way to hide the aura, even the materialize aura can be easily hidden.

Gyo

Advanced Ren, this counters the Hin. Huge amount of aura has to be concentrated in the eyes

Sho

Advanced Ten, enhances Ten more!. One can also strengthen an object s/he is holding

Kou

A combo of nen ability, concentrating the aura in one part of a body. (methinks strengthen types use this)

En

An advance technique. The aura can only manifest to a certain minimum distance, if one pactices En, the aura expands.

Kinds on nen users

1. change (henka)-transform the aura's properties like changing the aura into a rubber.

2. materialize (gugenka)-from the person's aura s/he can materialize an object
3. control (sousa)-contol a person and objects
4. strengthen (kyouka)-it can make a person stronger. Like he can punch with a damaging effect of a missile.
5. release (hoshutsu)-to control an aura that is detached from the body, like shoooting aura bullets, making aura puppets.
6. special (tokushitsu)-Special type is very unique, you can compare it to being a 'gifted kid', it's something innate (from the genes o environment), it can't be learned

Limitation and Vow

It's a rule that you will set and you must abide to it. The stricter the rule, the greater will be the result of an attack

Hisoka's aura sorting rule based on trait

change (henka)-moody liar (like him)

1. materialize (gugenka)-worries a lot
2. control (sousa)-practical/pragmatic thinker
3. strengthen (kyouka)-naive/ simple minded ^_^
4. release (hoshutsu)-irky, short tempered
5. special (tokushitsu)-charismatic and uhmmm something very special about them ^_^

to read the diagram

To make things easier, let's take the case of Kurapika-sama:
Kurapika is a materialize(gugenka) type nen user, he can easily learn other nen abilities that are close to his nen ability in the diagram. Beig a materialize(gugenka) type nen user, it will be favorable to him to use a Special(tokushitsu) ability. But if he tries to use a sterengthen (kyoka) type abilities, it will not be favorable to him, probably he can only utilize 50% maximum.

another case is Kastoro:
he's a strengthen(kyoka) type, but he wanted to use the "Double image" technique so he have to tap on to Control(sousa) and Materialize (gugenka) abilities. As you can see from the diagram, Control(sousa) and Materialize( gugenka) are away from Stengthen (kyoka), hence the combo had been incompatible with each other. This incompatibility makes his aura lesser efficient (that's why he didn't realize his hand was tied up by Hisoka), a very fatal mistake leading him to death.

to sum it up, the nearer the Nen types to an individual's Nen in the diagram, the more favorable it is.

Kurapika's sensei Nen explanation

Pls refer to episode 45