How do I show a count or index number of the items returned in a query loop?

How To
1

For example,

On my home page, I’m displaying a getting started section with 3 posts from a specific category. I want to dynamically display the count or index of each post displayed in the loop.

So for the example loop, it’d be:

1 - Post Title
2 - Post Title
3 - Post Title

A loop with 6 posts would be:

1 - Post Title
2 - Post Title
3 - Post Title
4 - Post Title
5 - Post Title
6 - Post Title