Hardware & Software Troubleshooting.
Network Installation, Configuration & Troubleshooting (TCI/IP, LAN, Wireless, PtP, PTMP, DHCP, DNS, VLAN, Firewall, Routing, IPsec, VPN, Load Balance).
Microsoft Windows Environments (XP/Vista/7/8/10/WS 2008/WS 2016, Active Directory AD).
Microsoft Office Suite (2003/2007/2016/365).
Debian, Ubuntu, Kali, MacOS, ProxmoxVE.