Acronyms are psuedo-words made up from the initials of a phrase. The one you're most likely to see, in the context of FAQs (frequently asked, or answered, questions) is to RTFM.
I'll put a few here, but I'm not going to be an acronym dictionary. If you can't figure one out, then use your comman sense, and search for it using a search engine, or check your e-mail clients documentation (that often contains a few), else search the internet for “TLAs” (three letter acronyms, whether or not they're three letters long).
In my humble/honest opinion
The “H” usually stands for honest or humble (but it often isn't “humble”).
Laughs out loud.
Which is different from how LOL used to mean “lots of love,” in traditional letters (on paper).
Rolls on the floor laughing
It often has more letters on the end too, you can figure out what they may mean by yourself.
Read the ??????? manual.
You can pick your own choice for the “F” word.
Three letter acronyms.
Which also includes ones with more than three letters.
Ta ta, for now.
A British way of saying, “see you later.”
Windows, Icons, and Mouse Pointer
A generic description for something that uses a graphical user interface (GUI), rather than plain text.
What you see is what you get
Usually used in the context of some file editor, where the editor (often approximately) shows you what the end result may look like, as you edit it.