Learning:

Microsoft Virtual Academy

Powershell skript-database

SCCM:

New and relevant blog
http://www.scconfigmgr.com/category/configmgr/

An other very good blog
https://crankdesk.wordpress.com/category/sccm/

The most slish blog 
http://blogs.technet.com/b/configmgrdogs/

The best –
http://www.truesec.com/Tools/Tool/Deployment_CD

Powershell:

ScriptDBs:
https://gallery.technet.microsoft.com/
Powershell Gallery               

Info 

Azure:

Lots of Videos and News:
https://wazcommunity.wordpress.com/

Debugging:
First you should read this introduction:
https://powerintheshell.com/2015/07/08/debugging-nutzliche-tools/

Some nice debugging introduction – videos
Defrag Tools

You need to know this forum:
http://forum.sysinternals.com/