A user doesn't directly create processes themselves, instead processes are created anytime a program is run.
So, short, but not entirely accurate answer: Do ANYTHING on Linux and you'll cause processes to be created and destroyed.
The Linux kernel doesn't consider itself a process, therefore it has no process id.
mkdir aptech/Linux
No!
mkdir directoryname
It isn't. RTLinux is a separate microkernel that runs Linux as a process. The Linux kernel is essentially unmodified.
Linux is a monolithic kernel. Some operating systems with a microkernel use Linux as a process for providing drivers, but this is irrelevant to mainstream Linux.
Linux from scratch is a book describing how to create and build your own Linux distribution from nothing, building every package from source and installing it.
"crontab -e".
fork
In a Linux terminal, the command to create a new directory is: mkdir .
With the top command.
The idea behind Linux was to create an operating system that could run UNIX software, but would be free.