I've been wondering about this. I was planning on making a game with Undertale mechanics (battle system) and I got caught on GUIs touching one another. I've seen this done multiple times with the good example of Sunder Tale.
I want to know how to detect when Label A hits Label B.
Thanks for any and all help!
Roblox doesn't have anything built in for this, but you can use 2D Collision Detection for it. I haven't used it myself, so I can't tell you too much about it, but it seems like that link will have all you need.
For additional help, go here. Hope this helped.