I’m new to Unity and scripting/programming, but can at least understand basic concepts and scripts.
So I’m trying to make a 2D game similar to basketball. I need help with scripting a ball going into a box(trigger) that registers a +1 score and resets/respawns the ball to it’s position from game start(not sure if I have to script ball spawn point too.).
Will accept both C# and UnityScript. Thanks! 
Try watching some tutorials on the BASICS of Unity to get an understanding of how things are done. Might help you get a better grasp on things you want to achieve.
For what you are asking, you will need to do your research on things. Google is your friend…