What does no hud mean in Star Wars battlefront 2

No HUD (Heads Up Display) means that there will be nothing on the screen except your character. For example: there will be no cross hairs, map, current weapon (Other than seeing it on the screen), how much ammo you have left, secondary weapon display, stamina, or health displays. There will be no way to tell how much health you have left or stamina so be careful when you use it.