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I have to second Miki on this. If I were you, I would take it:

1. Duplicate titles
2. Duplicate content
3. On-page links
4. Meta descriptions

The on-page links issue may be diluting your link juice, but duplicate titles and content could actually be affecting your indexability. There's likely overlap between the duplicate titles and duplicate content problems, so fixing titles may take care of a lot of the duplicate content; wrap up what's left after the titles are fixed. Take care of the missing meta descriptions after these more systemic issues have been addressed.

Good luck!

Hi Alice,

As the other posters have noted, the Help Hub and the Beginner's Guide to SEO are both excellent resources for learning the ropes. I'd keep an eye on the blog, too, as posts frequently deal with using Moz tools. You'll have it all down in no time.

Matt

Hi there!

I'm so sorry for the inconvenience! We had a bit of trouble with our last Mozscape Index—where OSE gets its information—and decided not to release it. As a result, it's been somewhat longer than usual since the last refresh. As of today, the problem should be solved, and the numbers should be up-to-date.

You can learn more about the issue at the Mozscape blog, here:

http://moz.com/products/api/updates

The most recent two posts deal with this problem.

Let us know if you're still having issues.

Depending on how you implement the canonicals, you should see a decrease in your duplicate errors, which will be replaced by canonical notices. Ideally, there won't be anything to ignore.

*Edit: Miki beat me to it, but here's a little more explanation.

The first thing to note here is that Google's indexing doesn't actually have any effect on your Moz crawl report. All of the data you see there comes from our very own rogerbot, which crawls similarly to googlebot.

Though Google's crawler has a wide variety of ways to locate and index content, rogerbot can only crawl links on your site. If your crawl report is picking up each of these URLs, then there must be links pointing to those URLs somewhere on your site. The danger here is that Google and the other search engines will pick up those variants and not be able to determine which of them is the "real" one. That could lead to a) Google listing a URL you'd rather it didn't, or b) Google not understanding how to list your site at all.

A few of these have pretty simple fixes—index.html should be 301 redirected to your root domain, for example. Rel="canonical" is very applicable here, too. Here are a couple resources you may want to check out:

http://moz.com/learn/seo/canonicalization - Best practices article on canonicalization
http://moz.com/learn/seo/redirection - Best practices article on redirects

I hope that helps!

Matt Roney
Moz Customer Mentor