Everything on Always on Availability Groups series

Step By Step configuring Windows 2012 R2 fail over cluster How to setup windows cluster for Always on Availability Groups

AlwaysOn Availability Groups: Step by Step Setup Step by Step procedure to setup Always on Availability Groups

Configure Read only routing for an always on availability group

Always on troubleshooting: 

http://mssqllover.blogspot.in/2017/04/the-connection-to-primary-replica-is.html