The difference between [-] dash and [_] underscore in asset naming 

Over the weekend, I receive a few questions about naming convention that will help improve SEO. Although correct naming doesn’t have too much of an impact in SEO, it does help in certain situation when the crawler needs to infer the content of your page.

Some tips and tricks:

- If you are using space, delimit it by using a – instead of a _; to a crawler,
  this_is_a_page means “thisisapage” while this-is-a-page means “this is a page”
  so whenever a crawler wants to match a keyword, you will want to have zune-music-player instead of zune_music_player

It is also advisable to give meaningful names to your pages or pictures, 12312inwf23.jpg doesn’t help tell what the picture is to a crawler but zune.jpg does help a lot.

That same advice applies to all other files that you want the crawler to crawl to (e.g. .mp3, .jpg,. html, etc)