How do I free up storage space on my Windows 11 PC?

Start with the built-in options first: Settings → System → Storage, then Cleanup recommendations / Storage Sense. I’d also check Downloads, Recycle Bin, large personal media folders, and Apps sorted by size before touching anything under C:\Windows or Program Files. A visual disk-space map can help you see which folders are actually large, so you don’t delete blindly. Back up anything uncertain before moving or deleting it.