What to do when your Mac panics during booting, and enters a boot loop, or when it simply fails to get to the login window.
systemextensionsctl
Big Sur and Monterey allow kernel extensions with limitations, particularly on M1 models. Full details, including how to control them.
Management of kernel extensions has changed significantly in Big Sur and later. This overview for users contrasts kexts with user-level extensions which are replacing them.
The Eclectic Light Company 