Learn about Nen.... 
Ten- Ability to maintain ones aura from being loose or spread in the 
 surroundings. The condition in this kind is stronger than normal 
 strength. 
Shu- (like shu masutani? hehe) An advance structure of Ten. This form is where 
 one person can stream his/her aura on an object and it becomes 
 a deadly weapon. (HISOKA?!!) 
Kou- unlike the Shu where you place your aura on one object, Kou allows 
 it to stream one's aura on one part of the body (leg, feet,fist, anything 
 as long as it is a part of the body) And that part can be a deadly weapon. 
Zetsu- Ability to hide one's aura. (This is the technique used by Gon and 
 Killua when they stalked or rather followed the two members of Ryodan) 
Ren- (Ren and stimpy? hehe) a more advance structure of Zetsu. It is the opposite 
 of Zetsu. If Zetsu hides auras, this one makes the aura stream 
 more into the body than the normal stream. Also, with this 
 technique, your aura can be excessively difficult to be spotted
 that is why it is much advanced than Zetsu. 
Gyou- Ability to view the aura of another person. It is again a much advance 
 structure of Ren. in order to attain Gyou, the aura must be streamed 
 around the eyes and Voila! you see everyone's aura! (Hehe *_*) 
Ken- Advance structure of Ten and Ren combined. To attain Ken, (EEEE!! 
 Ken in Weizz Kreuzz?)(No idiot!) one must master Ren. 
 IF THERE ARE KINDS OF NEN THERE ARE ALSO TYPES OF NEN 
 (sounds like topics in math and science T_T) 
Henka- ability to make the aura's qualoty change, tranform..whatever! 
 *Henka type of person is someone who habitually changes one's mind 
 and often tell lies. 
Houshutsu- Ability to make the aura stay away from the body..(um i don't get it) 
 *Anyway, Houshutsu persons are short tempered and has a broad sense in 
 intellect 
Gugenka- ability to make an object out of ones aura 
 * Gugenka persons are.. always bothered, disturbed by little things
 In short, worrier. (EH?! KURAPIKA IS A GUGENKA! BUT I DON'T THINK 
 HE WORRIES A LOT!) 
Kyouka- This type of nen can make a body part stronger than the normal!
 (What are they, abnormal?) Sounds like Kou. 
 * Kyouka persons are STUBBORN and SIMPLE-MINDED!!! (Guess who?) 
Sousa- MAnipulates objects and I dunno..living things(?) 
 *Sousa persons are practical (Hey..don't look at me. I also don't 
 know who but I have an idea.) 
Tokushitsu- LAst but not the least. This type of nen is not included in ]
 the other 5 types. 
 *Tokushitsu persons are..(I asked a bit of help here) I Think
 Tokushitsu people are the kind that believes in the individuality 
 of a person as someone having his/her own soul. (I don't know 
 that's how i understood it) And they also have charm. More of like 
 being liked by other people. T_T; gomen...