Literally copied code from a tutorial but it won't work !

I attach this code to an object but nothing happens.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class MyFirstScript : MonoBehaviour
6. {
7.     public float speed = 5f;
8.     void Start()
9.     {
10.        
11.     }
12.  
13.     void Update()
14.     {
15.         float h = Input.GetAxis("Horizontal");
16.         float v = Input.GetAxis("Vertical");
17.         Vector2 pos = transform.position;
18.         pos.x += h * speed * Time.deltaTime;
19.         pos.y += v * speed * Time.deltaTime;
20.         transform.position = pos;
21.     }
22. }
23.  

So I searched a bit, looking for these classes and methods but I can't find anything wrong.
I thought maybe I'm not attaching it to the object properly or is it because of the script itself?
So I tried going with something simpler and made a new script.

Code (CSharp):

1. public class moveDidi : MonoBehaviour
2. {
3.     public float speed=10f;
4.     void Start()
5.     {
6.     }
7.     void Update()
8.     {
9.         transform.position += transform.forward * speed * Time.deltaTime;
10.     }
11. }

But again this also didn't work.
So I tried again with another one.

Code (CSharp):

1. public class banana : MonoBehaviour
2. {
3.    
4.     void Start()
5.     {
6.        
7.     }
8.  
9.     void Update()
10.     {
11.         transform.position = new Vector2(0, 2) * Time.deltaTime;
12.     }
13. }

And it worked. However it is the only one that works. What am I doing wrong here?

 

I don't know if it's related to the issue of your code not working, but C# is VERY case sensitive, also watch your spelling, if you spell a word wrong your code definitely won't work.

 

I tried this and the code is being executed. I tried a couple other things to fix it, but none worked.
Then I changed the code from

Code (CSharp):

1. public class moveDidi : MonoBehaviour
2. {
3.     public float speed=10f;
4.     void Start()
5.     {
6.     }
7.     void Update()
8.     {
9.         transform.position += transform.forward * speed * Time.deltaTime;
10.     }
11. }

to

Code (CSharp):

1. public class moveDidi : MonoBehaviour
2. {
3.     public float speed=10f;
4.     void Start()
5.     {
6.     }
7.     void Update()
8.     {
9.         transform.position = transform.position + transform.forward * speed * Time.deltaTime;
10.     }
11. }

And it worked. I don't know why this happens. So I managed to make this one work and I went back to first code from the tutorial.
I tried using

 Debug.Log("H=" +h);

in the update() method, and the result is always H=0.
Then with a bit of googling, I realized that I need to press the arrow keys for the object to start moving, I was just sitting and waiting for the object to move by itself...