Practical Ecommerce provides some great tips for where to start with SEO in this article:

SEO: Which Pages to Optimize First?

While you may love to see search results improved for every page on your website, optimization of even a single page takes considerable time. Since many small businesses run on limited resources, understanding how to focus those resources on the pages that will make the biggest impact is key. The link above digs into the following strategies:

1. Using business goals to align SEO efforts with company objectives.
2. Prioritizing optimization based on site hierarchy (ie top level navigation).
3. Focus on pages that have the greatest potential to drive customer conversion.
4. Review title tags, eliminate duplicates and replace non-unique tags.

Has anyone implemented these strategies or found others more helpful?

Practical Ecommerce is at it again - encouraging businesses to analyze the success of their 2015 holiday campaign now while you still remember the details of your original plan, execution, and goals. Then use this data to optimize for the next holiday season. Really, though, these tips are great to keep in mind anytime you've come out of a serious SEO campaign. 

You can find the original article here:

SEO: Prepare Now for 2016 Holiday

Here are a few highlights:

1. Honest analysis. Understanding your strengths helps you plan to replicate them in the future. Be sure that you don't underplay or try to spin your weaknesses though. Areas that performed poorly provide an excellent opportunity to tweak your strategy for the future, assuming you take the time to pinpoint why your plan didn't work as expected.
2. Start now. SEO reporting only looks back so far. Every day you wait is a day of data you lose.
3. Look at the big picture. For example, compare entry page data with keyword data to skirt around the shortfalls of keyword data. Also, compare year over year (versus month over month) as the bigger picture will show you the real seasonal trends.
4. Reconsider 'gifting' keywords. If you included these in your campaign, take the time to determine if they actually yielded any returns. Often you'll find that there are better ways to drive traffic.
5. Archive your holiday pages. SEO uses "authority" or the age of the URL as one of the ranking factors. Tuck your landing pages away until next year, then bring them out and clean them up when the time arrives. You'll have an instant head start. Just be sure you do not change the URL.

Are there any key take-aways that you've gleaned from a recent SEO campaign analysis?