basic code

Question 1

How to move an object?

Answer 1

transform.Translate(Vector3.forward * speed* Time.deltaTime);

speed is the float variable.

Question 2

How to rotate an object?

Answer 2

transform.Rotate(Vector3.up * speed * Time.deltaTime);

speed is the float variable.

Question 3

add velocity to the rigibody?

Answer 3

GetComponent().velocity = new Vector3(0, 10, 0);

x axis, Y axis, Z axis

Question 4

How to detect a collision

Answer 4

void OnCollisionEnter(Collision col) {
		if(col.gameObject.name == "Player(Clone)"){
	   score += 100;
	   print(score); 
	   }

}

the if statement inside checks if the object collided with is a certain tag name. the col can be named anything.

Question 5

Is it better on performance to find a gameobject by name or tag. When should this be called?

Answer 5

Finding a game object with by Tag is better for performance and it should be done in the start and awake function.