It is necessary to learn some new words if you...

Newbie: 

A person new to a game, concept, or forum. Not to be confused with n00b, a stupid person. Newbies are just new.

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Newb: 

Someone who is new to the activity that they are currently partaking in. Very often this term is used pertaining to computer games. Contrary to popular belief, a newb and a n00b are not the same thing, as a newb can and will get better where as a n00b will partake in activites meant mainly to aggrivate other players. 

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Noob: 

A "noob" is a person who is new or inexperienced in a subject, usually an online game. Noobs are usually annoying and excessively stupid. Do not confuse noobs with newbs, who are inexperienced players that tend to be more mature and strive to become better.

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N00b: 

A inexperienced and/or ignorant or unskilled person. Especially used in computer games.

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Nub: 

One who sucks at a particular video game, they are not new to the game, but possess some determent that prevents them from playing well, no matter how long they practice playing the game.

So the next time you call someone something, please make sure you call him or her the right word.
Thanks for your cooperation, and your time.