How to move an object in world with script

I am a beginner in scripting and unity but how can i move with script an object in my scene?

You can use a variable to set a constant move like:

private float speed = 5.5f; //Base Velocity

then apply this to your script in Update function to be called every frame and start moving …

void Update(){
transform.Translate(speed * Time.deltaTime, 0, 0); //transform.Translate assumes this parameters: (X,Y,Z) put the speed variable where you want to move.
}

Hope it helps!