I am a new Linux user. How do I display the process on the Linux based server or desktop/laptop in easy to read tree format using bash shell prompt?

Linux and Unix are multitasking operating systems i.e. a system that can run multiple tasks (process) during the same period of time. A process is nothing but a running program (command) on Linux or Unix-like systems.

The pstree command shows running processes as a tree.

Full article here:
Linux/Unix: pstree Command Examples: See A Tree Of Processes (nixCraft)