Hey Anna,
It seems not too long ago I asked the very same question when I was new. Dont worry you will get it! I dont mean to do this to you, but I am gonna play the "teach a man to fish" role now because thats what the fine people of this site did for me. I am glad they did and so you will be too.
In the members only downloads section there are descriptions of what the abbreviations on this site mean. Check it out. You will be glad you did.
I do admit, there are way too many TLA's in this industry (TLA is a three letter acronym for THREE LETTER ACRONYM)
happy searching
Campy