I don't understand two things in the output of git diff:

$ git diff 8bdc f5fa
   diff --git a/text.md b/text.md
   index 4202174..6ef3a44 100644
   --- a/text.md
   +++ b/text.md
   @@ -3,3 +3,4 @@ title: Foo
   author: Peter

   +Once upon a time...

1. What does the line with the word "index" mean?

2. What does the line with the @@ mean?

How are these @@ called? Do they hava a name?

What does the numbers between the @@ mean? They refer somehow to the
changed lines, I guess. But what exactly do they say?


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