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
- 1080 Views
I'm not always sure that I'm correct, but....
05/10/2011 07:04:13 PM
- 775 Views
I didn't see any errors
05/10/2011 07:24:27 PM
- 757 Views

Must ... have ... grammar.
05/10/2011 07:53:34 PM
- 945 Views
For you and Tom as well, the same question about question eight.
05/10/2011 08:33:39 PM
- 1211 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
- 714 Views
Er...yes I meant them as a singular idea...
*NM*
05/10/2011 08:47:34 PM
- 449 Views

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

I can live with being wrong, at least in the sense of technical error.
05/10/2011 10:06:30 PM
- 744 Views
Let's just pare this down to the bare bones.
06/10/2011 01:37:30 AM
- 604 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
- 750 Views
You bring up a point that I was researching the other day
05/10/2011 08:53:40 PM
- 797 Views
You guys mean a hyphen, not a dash.
05/10/2011 09:00:25 PM
- 730 Views

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

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

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

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

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

"We want to be nothing if not persistent."
07/10/2011 02:39:19 PM
- 701 Views
Doesn't matter.
07/10/2011 03:12:14 PM
- 728 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
- 793 Views
What.
06/10/2011 06:17:41 PM
- 786 Views
Those cases are not the same, because those words are already possessive in their own right.
06/10/2011 10:52:06 PM
- 780 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
- 699 Views
Likely so; I have the same problem, but usually when writing by hand.
05/10/2011 09:53:08 PM
- 678 Views
#1) I do not use NetSpeak while playing games, texting or using social media.
05/10/2011 11:34:12 PM
- 696 Views
What about NateSpeak? *NM*
06/10/2011 04:01:08 PM
- 341 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
- 340 Views
I freebase split infinitives on a regular basis.
06/10/2011 01:53:36 PM
- 624 Views