Hi starry-eyed reformer and welcome to FlyerTalk! YGM is a polite way of saying "You've Got Mail" it notifies the thread-starter that they should check their e-mail. A great place to learn about the acronyms is in the glossary under the Help tab. You will find some other useful pages there too. As far as learning about miles/travel/etc, click on the FT Miles and FT Travel links at the top of your page and peruse the forums. You'll be a guru in no time. I've been on this community only a few short months and already was able to make $1600 getting bumped from flights over Christmas.
Have fun!
[This message has been edited by gt_croz (edited Jan 19, 2004).]