Web apps (for MS Office/Teams), Wine (mostly for games and random apps), and for everything else, an optimized Tiny11 Core VM + WinApps for seamless windows/integration with Linux. My Tiny11 only uses 0-1% CPU and 600MB RAM on idle so I’ve got no issues running it in the background, besides it takes only a couple of seconds to launch, if I wanted to start it on demand.
I’ve also got a portable SSD with a copy of Windows installed on it, just in case I need it for some firmware updates or something (although I’m on a Thinkpad so pretty much everything can be updated via LVFS, but I keep it around just in case + it’s portable so there’s no harm in having it around).