Simple movement tutorial

MoveObject.cs

using UnityEngine;

public class MoveObject : MonoBehaviour
{
    void Start()
    {
        // Changes the position to x:1, y:1, z:0
        transform.position = new Vector3(1, 1, 0);

        // It is also possible to set the position with a Vector2
        // This automatically sets the Z axis to 0
        transform.position = new Vector2(1, 1);

        // Moving object on a single axis
        Vector3 newPosition = transform.position; // We store the current position
        newPosition.y = 100; // We set a axis, in this case the y axis
        transform.position = newPosition; // We pass it back
    }

    private void Update()
    {
        // We add +1 to the x axis every frame.
        // Time.deltaTime is the time it took to complete the last frame
        // The result of this is that the object moves one unit on the x axis every second
        transform.position += new Vector3(1 * Time.deltaTime, 0, 0);
    }
}