Still easy. You just have to learned different concepts. Someone in web needs to be familiar with databases, some protocols like HTTP, DNS, some basic Unix admin,.. Someone in low level kernel code will need to know about hardware architecture, operating system concepts, assembly,... But the coding skill stays the same mostly. You're still typing code, organizing files, and fiddling with build systems.
Still easy. You just have to learned different concepts. Someone in web needs to be familiar with databases, some protocols like HTTP, DNS, some basic Unix admin,.. Someone in low level kernel code will need to know about hardware architecture, operating system concepts, assembly,... But the coding skill stays the same mostly. You're still typing code, organizing files, and fiddling with build systems.