Windows Server (2016/2019/2022), Active Directory (AD DS, GPO), Linux (Ubuntu, Debian), Windows 10/11, Hyper-V, Virtual Machine Management, Infrastructure Provisioning, AWS Basics, Zabbix (Setup, Alerts & Custom Metrics), Log Analysis, Root Cause Analysis (RCA), Hardware Diagnostics, TCP/IP, DNS, DHCP, VPN, Router & Switch Configuration, Network Security Protocols, Access Control, PowerShell Scripting, Bash, Docker, Git, REST API Integration, CI/CD Pipeline Fundamentals, JavaScript (ES6+), React, HTML5/CSS3, Client-Server Architecture, Disaster Recovery Planning (DRP), Backup & Recovery Management, System Migration