Sharepoint blogs useful

http://sharepointconnoisseur.blogspot.com/2011/04/why-sharepoint-2010-search-does-not.html

https://blog.pathtosharepoint.com/

http://sharepointconnoisseur.blogspot.com/search/label/SharePoint%202010%20performance

https://technet.microsoft.com/en-us/magazine/dd776503.aspx

https://blogs.msdn.microsoft.com/sanjaynarang/2009/04/18/sharepoint-performance-stress-load-testing/

http://geekswithblogs.net/Norgean/archive/2012/11/20/get_splogevent.aspx

https://technet.microsoft.com/en-us/magazine/jj902496

Hybrid for SharePoint Server 2013

https://technet.microsoft.com/en-us/library/jj838715.aspx

https://technet.microsoft.com/en-us/library/dn607311.aspx?f=255&MSPPError=-2147217396

https://gallery.technet.microsoft.com/Recover-List-from-an-04fa609a

Creating a Hybrid Configuration with Exchange and Office 365

http://exchangeserverpro.com/creating-hybrid-configuration-exchange-office-365/

Upgrading from SharePoint 2010 to SharePoint 2013 Step by Step

https://blogs.msdn.microsoft.com/alimaz/2012/07/17/upgrading-from-sharepoint-2010-to-sharepoint-2013-step-by-step/

Copy databases to the new farm for upgrade to SharePoint 2013

https://technet.microsoft.com/en-us/library/jj839720.aspx?f=255&MSPPError=-2147217396