Hyphens are used to join words together - like in tax-free limit - and dashes are for separating thoughts/adding extra information (like I did in this sentence).
I tend to use the word "dash" for all those things without thinking about it, but that's incorrect.
Of course, just to be annoying I have to add that a proper em-dash is formed with ALT-0151 (—). :p
Well, yes. But I wanted an en-dash for my dashes and I don't know how to make them except with ALT+hyphen. I don't think that works in Internet browsers, just in the programs we use at work for creating and editing documents. 

An en-dash is formed on the Internet (and in most text programs) via ALT-0150 (–). It's like magic. Keyboard magic.
Tim keeps trying to get me to learn those keyboard shortcuts but I prefer to leave it for the nerds.

Assuming you have Windows, but I assume Mac has an equivalent utility if not; in the former case, you can just type "charmap" into the search function and Windows will dutifully find it for you (which is when I generally yank it over the desktop so I have it ready to hand when I want to type something like, say, a lemniscate.) I recommend extended ASCII because there are not many characters, most of them you do not need to learn anyway (while you CAN make an "F" with ALT+70, it is easier to just use SHIFT+F) and all of them are, so I understand, the same in Unicode. Some just become second nature because they get used so much (in my case, ALT+248 for "°" and ALT+241 for "±"

Honorbound and honored to be Bonded to Mahtaliel Sedai
Last First in wotmania Chat
Slightly better than chocolate.
Love still can't be coerced.
Please Don't Eat the Newbies!
LoL. Be well, RAFOlk.
Last First in wotmania Chat
Slightly better than chocolate.
Love still can't be coerced.
Please Don't Eat the Newbies!

LoL. Be well, RAFOlk.
Grammar junkies
05/10/2011 06:46:31 PM
- 1101 Views
I'm not always sure that I'm correct, but....
05/10/2011 07:04:13 PM
- 796 Views
I didn't see any errors
05/10/2011 07:24:27 PM
- 777 Views

Must ... have ... grammar.
05/10/2011 07:53:34 PM
- 963 Views
For you and Tom as well, the same question about question eight.
05/10/2011 08:33:39 PM
- 1235 Views
Tom can probably give you actual terms and correct rules, but here's my take on it.
05/10/2011 08:43:47 PM
- 733 Views
Er...yes I meant them as a singular idea...
*NM*
05/10/2011 08:47:34 PM
- 455 Views

Use them together, and only together, for fifteen years and we can discuss this again. *NM*
05/10/2011 09:32:30 PM
- 389 Views
That makes sense as far as it goes.
05/10/2011 09:02:42 PM
- 771 Views
But do you actually regard them that way?
05/10/2011 09:08:36 PM
- 770 Views
Yeah, pretty much.
05/10/2011 09:25:18 PM
- 726 Views
No, Joel. You're just wrong. Again. Get used to it. We have.
05/10/2011 09:31:21 PM
- 667 Views

I can live with being wrong, at least in the sense of technical error.
05/10/2011 10:06:30 PM
- 767 Views
Let's just pare this down to the bare bones.
06/10/2011 01:37:30 AM
- 625 Views
He made a mistake that I did not recognize as a mistake because I read his words as he intended.
06/10/2011 04:43:39 AM
- 774 Views
You bring up a point that I was researching the other day
05/10/2011 08:53:40 PM
- 816 Views
You guys mean a hyphen, not a dash.
05/10/2011 09:00:25 PM
- 749 Views

You're right of course!
05/10/2011 09:13:44 PM
- 833 Views
I frequently am.
05/10/2011 09:16:38 PM
- 837 Views
So I've noticed.
05/10/2011 09:19:38 PM
- 741 Views
I like telling people, too.
05/10/2011 09:34:50 PM
- 743 Views
You can use charmap.
05/10/2011 10:21:32 PM
- 789 Views
Achtung! Grammatik! :insert Nazi-saluting smiley as the Wehrmacht marches by:
05/10/2011 08:10:45 PM
- 866 Views
Good poll, especially for this site.
05/10/2011 08:11:10 PM
- 866 Views
Re: Grammar junkies
05/10/2011 08:33:06 PM
- 757 Views
People should talk in a way that can be understood, else they are not communicating.
05/10/2011 09:17:37 PM
- 808 Views
Re: "everyone's". ~winky~ *NM*
05/10/2011 09:22:18 PM
- 375 Views
Is it time for my lecture on superfluous apostrophes again?
05/10/2011 09:43:47 PM
- 712 Views

Unsurprisingly, I don't really agree with you at all on this point. :p
05/10/2011 10:29:59 PM
- 793 Views
I do not really think I am "right" on this one so much as "not wrong."
06/10/2011 12:01:36 AM
- 709 Views
But contradictions are inherent in the entire English language!
06/10/2011 01:25:39 AM
- 716 Views
Ghoti. Also, this is why Rebekah and don't argue this any more.
*NM*
06/10/2011 04:44:42 AM
- 332 Views

Sure, but not deliberate ones created by grammarians who know better.
06/10/2011 05:40:58 AM
- 721 Views
I'm going to listen to the others.
06/10/2011 06:17:18 AM
- 737 Views
Like I say, I appreciate exceptions when justified (and again, only claiming to be "not wrong." )
06/10/2011 07:26:18 AM
- 634 Views
But you are wrong
06/10/2011 02:17:40 PM
- 761 Views

I disagree.
07/10/2011 12:15:14 AM
- 706 Views

How utterly unsurprising
07/10/2011 02:21:38 PM
- 659 Views

"We want to be nothing if not persistent."
07/10/2011 02:39:19 PM
- 725 Views
Doesn't matter.
07/10/2011 03:12:14 PM
- 750 Views
Perhaps not, but it should, and I am not above being a lone voice crying in the wilderness.
08/10/2011 05:17:35 PM
- 816 Views
What.
06/10/2011 06:17:41 PM
- 805 Views
Those cases are not the same, because those words are already possessive in their own right.
06/10/2011 10:52:06 PM
- 801 Views
if you have trouble understanding my post it is more likely do to typing skills than grammar
05/10/2011 09:31:42 PM
- 717 Views
Likely so; I have the same problem, but usually when writing by hand.
05/10/2011 09:53:08 PM
- 701 Views
#1) I do not use NetSpeak while playing games, texting or using social media.
05/10/2011 11:34:12 PM
- 718 Views
What about NateSpeak? *NM*
06/10/2011 04:01:08 PM
- 349 Views
I did use that once to tell the story of you and CNRedDragon going to see Ice Princess. *NM*
07/10/2011 01:46:50 AM
- 352 Views
I freebase split infinitives on a regular basis.
06/10/2011 01:53:36 PM
- 642 Views