SharePoint 2013 does great job configuring things for you in search-driven publishing scenarios but there are a few things you should keep in mind to save yourself trouble.
On your public-facing website use the XML Sitemap and Robots.txt file to optimize your website for Internet search engines.
When building public-facing websites with SharePoint 2013 you should disallow anonymous users from overriding the Master Page on your website.
When using Device Channels on your website set the Vary: User-Agent response header to let Internet search engines know that different HTML is rendered to different browsers.
When building content aggregations with users’ information Content Search Web Part publishes account names in page source.