Yes I know how to program with BillboardGui's but I dont Know this, Ive seen this in games where theres BillBoardGui's that tells the player name above it how can i do this?
Make a BillBoardGui like a normal gui, and when you determin the player, set the text of it as '.Name' for the player. In order for others to see, you need to make the billboardgui connected to the player in some fastion in the workspace. (For example connecting it to their head.)