Every time we speak about SEO, we speak about Google.
The sitemap is a XML file which helps webmasters to communicate their URLs to the search engines, above all fresh URLs.
If you have a website with a lot of video you need to expose a video sitemap.
For both type of sitemaps you should need an help debugging, then you can use:
Googlebot-Mobile can detect clocking, even if you are not guilty, this is depending of how you redirect your users.
Do not ignore Google’s mobile bot. It could notice duplicate content too (between desktop content and mobile version).
So, consider the “Googlebot-Mobile” User-Agent.
This simple diagram can help you:
Official Google Webmaster Central Blog: Running desktop and mobile versions of your site.
This is a usefull tool to be reconsidered by the Google Bot after a penalty.
If your site isn’t appearing in Google search results, or it’s performing more poorly than it once did (and you believe that it does not violate our webmaster guidelines), you can ask Google to reconsider your site.
via Requesting reconsideration of your site – Webmaster Tools Help.
Google provides an easy solution to use web fonts, so you can be creative even with fonts respecting most browsers and the SEO aspects (no need of images!).
The Google Font API helps you add web fonts to any web page.
Benefits of the Google Font API include:
* A choice of high quality open source fonts.
* Works in most browsers.
* Extremely easy to use.