Can someone help me understand why this C# script isn't working?

Questions & Answers
1

I’m working on learning Unity & C#, so I’m just building a few random things in Unity to help me get the hang both Unity and C#, before I attempt to make an actual game. That being said I have a script that; seems like it should work, but doesn’t. Basically I’m attempting to change a variable in one script from a second script. PS. I’m very new to C# so please try and explain as simply as you can.
Script with my variables.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerBasics : MonoBehaviour 
{
	public static int Life = 10;
	public GameObject Player;
	public static bool fullPower = false;

}

I’m attempting to change the Life variable.
From this script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Lose_Health : MonoBehaviour 
{
	void OnTriggerEnter(Collider loseHealth) 
	{
		if (loseHealth.CompareTag ("Player")
			PlayerBasics.Life -= 2;
			Methods.HealthCheck();
	}
}

I can’t understand why that doesn’t change the variable, because I have to problems doing the same thing to reference it in this script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Methods : MonoBehaviour 
{
	public void fullPower()
	{
		//This is where the scripts for the main characters full power goes.
	}

	public void healthCheck()
	{
		if (PlayerBasics.Health <= 0) 
		{
			//This should run after anything that deducts health
			Death ();
		}
	}

	public void Death()
	{
		//This calls the GameOver scene
		
	}
}

I sincerely appreciate any help.

2

change

 PlayerBasics.Life -= 2;

to

      loseHealth.GetComponent<PlayerBasics>.Life -= 2;

then it will work.
if you want to access a component you should assign it first.

    loseHealth.GetComponent<PlayerBasics>.Life -= 2;

this code will get PlayerBasics’s component from the objcet that has a Boxcollider.

and about reference let me show you a simple example.

i want to change a variable from script 1 with script2.

    using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   public class Script1 : MonoBehaviour {
   public int number;

   }

********************************** and script 2

    using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   public class Script2 : MonoBehaviour {
   public  Script1 s1;//now I have a variable name s1 and I want to access to Script1 via this variable

     void Start(){
     s1= FindObjectOfType<Script1> ();//it will search the scene and find the object with that has Script1 component.
     }

     public void changeValue(){
     s1.number=5;//so the value of number is now 5 !!!
      
     }

   }