Welcome to Anandtech!
Here is some basic info:
Membership levels:
Junior Member: 0-20 posts
Member: 21-200 posts
Senior Member: 201-1000 posts
Golden Member: 1001-2000 posts
Platinum Member: 2001-3000 posts
Diamond Member: 3001+ posts
Lifer: 10,000 +posts
Elite Member: This status is only given by the Moderators. Elite members are bestowed this membership by being a key contributor to the forum in some unique way. It is not dependent on post count. Elite members have had as low as 500 posts. The Elite members of this forum are important and get a certain amount of extra respect. You can "Nef" (see below for definition of Nef) your way to Diamond Membership, but Elite can only be achieved by adding to the forums in some extra fashion.
The Search Function:
Use it. Before posting something that could be considered general knowledge or easily accessed by the general public (i.e. you found it on the web), use the search function to see if it has been posted before. If it has, there is no need for a repost!
The word "Nef." (mostly seen in the Off Topic forum section)
If someone "nefs", they are posting a useless post with the intention, or apparent intention, of boosting their post count.
Troll (mostly in the For Sale/ For Trade forum section for first definition, or Off Topic for second)
A Troll is either
a) Someone who rips people off in either selling or buying. This can be for various reasons, such as sending a product that doesn't fit the condition of what they stated it was before, to sending a bad check to someone who sold them something. If you are going to deal on the FS/FT forum, make sure you aren't dealing with a Troll. Known trolls are posted in there.
b) Someone who posts a thread that is intended to get people angry at each other and arguing.
Hope this helps some and welcome to the Anandtech Forums!
--datalink7