Software boundaries and limits for SharePoint 2013

Performance Improvement SharePoint 2013

IT governance in SharePoint 2013

http://technet.microsoft.com/en-us/library/cc262883.aspx

Enterprise Content Management

http://techcommunity.microsoft.com/t5/SharePoint-Blog/Best-Practices-for-ECM-in-SharePoint-and-OneDrive-for-Business/ba-p/60095