If you are interested to learn Development of SSRS reports in AX 2012 R2 then you can visit following links. Create Quick first SSRS report in Dynamics AX 2012 AX 2012 - AX-SSRS Report Design Concepts
Technical Tutorials x++,tips on issues or troubleshooting On Ax ERP ,Microsoft Dynamics 365,Ax 2012,Microsoft , U.S.,Business Software solution.