Check out example codes for "unity add component". It will help you in understanding the concepts better.
Code Example 1
//to add a new ridgidbody
gameobject.AddComponent<Rigidbody>();
//to add a new meshCollider
gameobject.AddComponent<MeshCollider>();
//Original answer by MakerBenjammin6, cleanup by me.
Code Example 2
void Reset()
{
//Your code here
}
Code Example 3
//This uses C# and unity
//to add a ridgidbody
gameobject.addComponet<ridgidbody>();
//to add a meshCollider
gameobject.addComponet<MeshCollider>();
//check out my profile
Code Example 4
//Use the AddComponent<T>() Method to add a component to your gameobject
GameObject gameObject;
gameObject.AddComponent<BoxCollider>(); //Component has to be an actual Unity component
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