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My visual studio script is not working in Unity

I just started game development and got into a problem
whenever I load my Visual Studio code into Unity it says
The refrenced script unknown on this behaviour is missing
This is my script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class VirtualManMovement : MonoBehaviour
{
// Start is called before the first frame update
void Start()
{
Debug.Log("Hello, World!") ;
}
// Update is called once per frame
void Update()
{
}
}
I need a solution for this

This may happen is the file name does not match the class name. Make sure that the file containing this script is also named VirtualManMovement.cs

Make sure in Unity you go to edit -> preferences and see that you have Unity External tools in Your IDE Selected.
Ensure your Code File Name is the same as your Class to prevent confusion.
I was confused as well when I first started. Hopefully, you find this useful

GameObject.SendMessage not working, how can i fix it?

I'm trying to do a script that when the player pass by a item, it activates it's effect in the player.
But this error apears:
This is my code:
`
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
public class Bonus : MonoBehaviour
{
public string name;
private void OnTriggerEnter2D(Collider2D collision)
{
if(collision.CompareTag("Player"))
{
collision.SendMessage(name, null, SendMessageOptions.RequireReceiver);
Destroy(gameObject);
}
}
}
`
I already tried adding the
SendMessageOptions.RequireReceiver
but it didn't work

What the error is trying to tell you is:
On your collision's GameObject there is no component attached that implements a method called whatever the value of name is (in your case doubleSpeed).
By default the option already is SendMessageOptions.RequireReceiver, if there is none you get that error message.
The receiving method can choose to ignore the argument by having zero parameters. If options is set to SendMessageOptions.RequireReceiver an error is printed if the message is not picked up by any component.
If you want to ignore the case where there is no receiver you would rather pass in SendMessageOptions.DontRequireReceiver
In general instead of using SendMessage at all rather get your component and call the method directly

Monobehaviour scripts in the file, or their names don't match the file name on newly made script

Why all my newly created script always have this error? Even though i had put in my intended code, all my script always show like this.
my code is this:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Testing : MonoBehaviour
{
public GameObject obj;
// Start is called before the first frame update
void Start()
{
obj = GetComponent<GameObject>();
}
// Update is called once per frame
void Update()
{
}
private void OnTriggerEnter2D(Collider2D collision)
{
collision.transform.position = obj.transform.position;
}
}

Welcome to Stackoverflow!
This issue is mostly caused when you create a script outside the Unity Editor, i.e. in your IDE or editor of choice. Whenever you want to create a script, you need to create it inside the Editor, by right-clicking in your project folder and selecting "New C# Script".
If you do create your script inside Unity, you need to make sure that the class name (in your case, "Testing") is the same as the script file name.
Regardless of whether these solutions work for you, please make sure to search for answers before posting, as there are multiple duplicate issues in the Unity forums.

SceneChange script compiler error: unable to access due to protection level

I have this script that allows me to change to a different scene when I push a button. I've used it multiple times before with no issue, but recently I've been getting this compiler error that's telling me the script can't be accessed due to its protect level. I did some research and it supposedly means something is set to private instead of public, but everything in my script is public to begin with. Please help? According to Unity, the error is the ".LoadScene" inside public void DoSceneChange().
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class SceneChange : MonoBehaviour
{
[SerializeField]
string levelToLoad;
public void DoSceneChange()
{
SceneManager.LoadScene(levelToLoad);
}
}

Creating a Scriptable Object in the Unity Editor

So apparently i suck at listening at my university, because i can't figure this out, not even with google...
How do you create a scriptable object in the editor? I have the project open, it looks like this:
Click the Create button as if you wanted to create a folder or C# script or anything.
Select the ScriptableObject from the popup menu.
Get this panel and finalize the object after selecting the script for it.
The problem is: i don't have the ScriptableObject button. I have a script that is a scriptable object (to make sure i even copied the one from the project of the university). I restarted Unity, i checked if there were any packages installed (there werent) and i googled quite a bit. But i just can't seem to get this working...
Is there anything i have to install or add first?
Thanks in advance!

You need another script to add the button which will create an instance from that scriptable object. something like that
using UnityEngine;
using System.Collections;
using UnityEditor;
public class MakeScriptableObject {
[MenuItem("Assets/Create/My Scriptable Object")]
public static void CreateMyAsset()
{
MyScriptableObjectClass asset = ScriptableObject.CreateInstance<MyScriptableObjectClass>();
AssetDatabase.CreateAsset(asset, "Assets/NewScripableObject.asset");
AssetDatabase.SaveAssets();
EditorUtility.FocusProjectWindow();
Selection.activeObject = asset;
}
}
You can check this Introduction to Scriptable Objects tutorial on unity website.

I can't comment so just place it like answer:
Don't forget to use UnityEditor.AssetDatabase.GenerateUniqueAssetPath coz simple AssetDatabase.CreateAsset can erase your data:
using UnityEngine;
using System.Collections;
using UnityEditor;
public class MakeScriptableObject
{
[MenuItem("Assets/Create/My Scriptable Object")]
public static void CreateMyAsset()
{
MyScriptableObjectClass asset = ScriptableObject.CreateInstance<MyScriptableObjectClass>();
string name = UnityEditor.AssetDatabase.GenerateUniqueAssetPath("Assets/NewScripableObject.asset");
AssetDatabase.CreateAsset(asset, name);
AssetDatabase.SaveAssets();
EditorUtility.FocusProjectWindow();
Selection.activeObject = asset;
}
}