Not sure where to go first? The list of topics below should point you in the right direction.
Network Automation with Ansible
I have many tutorials on how to use Ansible for Network Automation and there is also a course.
Network Automation Course using Ansbile
CCIE
How many CCIE’s are there in the world?
Software Upgrade Guides
A few simple guides on how to upgrade software on various Cisco Switches
Tutorials
Route Distinguisher and Router Target
Password Recovery
Cisco Password Recovery Guides
Cisco ISE
What is Cisco ISE – Simple Tutorial on basic ISE concepts