Whats all this 'ground crew' stuff ?

[ETE]

Im new to all this ..is there a forum with information on what exactly is a 'ground crew' ? a beginners sort of entry point perspective layout ..so we can get up to speed on how to approach this place?..

feels like walking through a revolving door and getting spun out back into the side walk on your butt..

I get the gist of whats happening but no clue how get up to speed so I can contribute

thanks