I am IT supporting companies with this hw/sw:
Servers: HPE, Dell, FS
Networking: HP, Dell, Cisco, ZyXel, Mikrotik, Ubiquity
OS: Windows Server 2008,2012,2016, Windows 10,8.1,8,7, Centos, Ubuntu ....
Virtualization: VmWare, HyperV, KVM
Full admin support corporate for example LigmanLighting EU, Forteq Group Czech, Donaldson Czech and IT consultation for municipal authorities and schools nearby.