SCCM Configmgr comes with 3 branches of 1606 (Current Branch, LTSB and Tech Preview) from October 2016 that helps to upgrade from SCCM 2012 to CB 1606 directly – All about Microsoft Endpoint Manager
Installing System Center 2012 R2 Configuration Manager
using SCCM 2012 in a LAB - Part 6. Deploying Software Updates - Configuration Manager 2012 - www.windows-noob.com
Install ConfigMgr 2012 R2 CU3 in your hierarchy - MSEndpointMgr
Beginners Guide Step By Step SCCM Console Nodes Overview
Real-time application installation for devices – All about Microsoft Endpoint Manager
How to fix "There is not enough available disk space on" when upgrading the ConfigMgr AdminConsole - System Center Configuration Manager (Current Branch) - www.windows-noob.com