Duplicate content how bad is it?

[UCDK]

I have a magento webshop and some of products have more than one link.

E.g. wolverine apprentice it has these two links

http://www.urbanclothing.dk/maerker-1/wolverine/wolverine-apprentice-6-tan-mens.html

and

http://www.urbanclothing.dk/wolverine-apprentice-6-tan-mens.html

Is that going to ruin my chances on ranking high on Google? If yes what should I do about it ?

And was does Linking Root Domains and Page Authority mean?

I fount it under the keyword ranking section.

[IPINGlobal54]

Duplicate content on site is not good - google basically sees the pages and thinks you are creating pages for the sake of it to occupy more of the results and gain more traffic.

What to do about it.

Although not ideal - you could just remove the pages and wait for the recovery - but this would likely mean a large loss of urls.

Best bet is to either sort your site structure out so you don't have the sub folder pages in the first place - and canonical tag the spare pages back to the originals so you are telling google which page is the one you want to rank for. On the pages that you add canon tag - add "follow noindex" to your meta tag so that google knows your intent.

Redo your xml sitemap and resubmit through GWT and you should see it sort itself out.

Another option would be to 301 the duplicate pages - but I would be inclined to go with the canon rather than build up a lot of 301's

[RobertFisher]

Good direction from IPIN and the rest of your question can be answered by http://www.seomoz.org/learn-seo/domain

Assuming you have 5 links from http://NewBoots.com, and they are all different (brown-boots.newboots.com, blue-boots.newboots.com, etc.) this would show up as 5 links from one linking root domain.

Page Rank is a measure to identify how strong a page is competitively based on links, etc. Here is the definition location http://www.seomoz.org/learn-seo/page-authority

Almost any definition question you have can be found using the moz search bar.

Best,

[UCDK]

I think I will choose the canon method sense I have more than 1000 products

Thank  your for suggestion it sounds like the best idea so far.