1. Building a Game with Unity3D

2. changes to example script
var myrigidbody:Rigidbody; // declare a variable of proper type myrigidbody=GetComponent(Rigidbody); // note javascript uses () instead of < > myrigidbody.AddRelativeTorque …  

3. +make a game with unity +brackeys
Unity Basics
make a game - 1
make a game - 2
Make a game- 3
make a game - 3b - camera
Make a game shadows + respawn
make a game - 5a - jumping
make a game quality settings
make a game - 7 – collectibles
make a game animation
many more videos: use the search in the title above

6. moving a sphere
function Start () { // saved for posterity     queriesHitTriggers=true;     blue_rotation = Input.GetAxis ("Horizontal") * rotationSpeed * -1 ;     blue_rotation*=Time.deltaTime;     rgdblue= GetComponent (Rigidbody);     rgdblue.velocity = new Vector3 (.1*rotationSpeed * Time.deltaTime, 0) ;     rgdblue.velocity=rgdblue.velocity*-1;     rgdblue.AddRelativeTorque (Vector3.forward * blue_rotation); //vector3 is 3D mgmt } function Update()  {      blue_rotation = Mathf.Abs(Input.GetAxis ("Horizontal") * rotationSpeed ) *-1;     blue_rotation*=Time.deltaTime;     rgdblue=GetComponent(Rigidbody);     rgdblue.AddRelativeTorque (Vector3.forward * blue_rotation); //vector3 is 3D mgmt }

7. Tips
A rotation completely describes an object's absolute orientation (or a change in orientation).
A direction specifies which way an object is pointing or facing, NOT it's movement direction (a rotating car on ice can be moving in direction x, but facing direction y.)
Rotations and Directions are (not easily) convertible into each other. But they have different characteristics when it comes to combining and comparing them.
You can add two Rotations and get a new rotation:
90 degrees + 90 degrees = 180 degrees.
But if you add two direction vectors you get a new vector that doesn't express a rotation any more. It is possible to 'convert' a direction to a rotation, but since the mapping is not one-to-one, you have to introduce additional constraints in order to arrive at a unique result. (This is basically what functions like the quaternion LookRotation() function do.)
Rotations are Quaternions
If you want to rotate around the world's "up" direction, regardless of the object's local coordinate system, you can try adding Space.World as the last argument to Rotate