as a IT admin and helpdesk guy in a smaller company, I use those Windows tools:
Greenshot - lightweight screenshot tool with editing
VsCode (this replaced notepad++ for me)
Microsoft Stream - making quick, easy guides
Terminal - part of Win 11, installable for Win 10, is really nice terminal app
PowerToys - my most used is the quick search bar where I sometimes put temp text or use it as a calculator (or opening apps), Text extraction, Fancy Zones, file preview (ctrl+space)
Edge vertical tabs - dunno if you would count it as a tool but having vertical tabs with groups is really amazing IMO
as a IT admin and helpdesk guy in a smaller company, I use those Windows tools: