Part 1, The Machine and Its Evidence established one working rule: the GUI shows you what exists, and PowerShell is how you inspect it precisely and repeat the work across ten machines. Windows Server administration assumes you are somewhere else...
Your first job in this field will hand you a domain-joined Windows machine and expect competence by Friday. Nearly every security career runs through the Windows estate whether it was planned or not...
My first Linux distribution no longer exists. I mention that because it lands two points at once: Linux is old enough to have history, and the skills transfer anyway...