Check out example codes for "moving an object in unity". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
    void Update()
        // Move the object forward along its z axis 1 unit/second.
        transform.Translate(Vector3.forward * Time.deltaTime);

        // Move the object upward in world space 1 unit/second.
        transform.Translate(Vector3.up * Time.deltaTime, Space.World);

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