You’ll have to replace all the applications you use, and you’ll have to hunt down software and drivers for your printer, wireless network adapter, and other peripheral devices—or replace them with Linux-compatible equivalents.
Well at least someone is honest.
/johnny
Not 100% correct - you can run emulators, and some are directly compatible. My biggest concern was always excel replacement/compatiblity. The emulators do a good job on that.
As to drivers - in the Mac environment I have NEVER had to look up a driver or worry about peripherals since my first home mac in 1996. Can’t say on Linux.