Most of the tutorials are created on Windows Server 2016, but works also with newer Windows Server 2019. Installation, Updates, Active Directory , GPO, DNS, DHCP, DFS, Hyper-V, FailOverCluster, NLB. Go thru Event Viewer errors, check Device Manager and Task Manager.Troubleshoot problems and find a fix.
Tutorials about CentOS 7: installation, updates, troubleshooting. Also, using CLI for managing files, install new programs, managing users.
VMware ESXi and vCenter Server – installation and managing. Dealing with new VM – create, modify, delete, clone, snapshoots.
Cisco and Extreme Networks CLI – setup, maintain, upgrade firmware, backup and restore configuration.
Troubleshooting steps (from CompTIA)
Step 1 Identify problem
Step 2 Establish a probable cause (question the obvious)
Step 3 Test probable cause theory to determine actual cause
Step 4 Establish an action plan and execute the plan
Step 5 Verify full system functionality and, if applicable, implement preventative measures.
Step 6 Document findings, actions, and outcomes