Gui positioning?

Stubbsy

Contributor
I'm making my first ever mod, and I'm stuck on the positioning. Before people kill me, things like the scoreboard is a Gui right? I'm not entirely sure.
How does the position = "0 0"; work? Basically I want my little Gui box to position in the bottom left of the screen, and stay there when re-sizing the Legions window.
I'll be honest, I don't know how to position things.
 
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