how to get game oject with script in unity C# code example

Example 1: unity get script from gameobject

obj.GetComponent<Script>();

Example 2: c# unity gameObject.script

void Update()
{
  string Thing = gameObject.GetComponent<CustomScriptName>().Variable;

  if (Thing == "String1")
  {
	DoStuff();
  }
  
    if (Thing == "String2")
  {
	DoOtherStuff();
  }
}