Process Lifecycle and Service Flow

Understand the difference between a program stored on disk and a process running in memory, and learn the basic ideas of PID, parent process, and thread.

List, filter, and stop processes from the command line with a stronger habit of inspecting before terminating.

Understand how foreground work, background jobs, and persistent sessions differ so long-running commands do not surprise you or die unexpectedly.

Understand when a background job is enough, when a persistent session is better, and when the operating system should supervise the work as a service.

Check CPU, memory, and disk pressure more systematically so a slow system is diagnosed from evidence instead of guesses.

Connect services to process supervision so start failures, restart loops, and service health are easier to diagnose before you restart anything.

Inspect, start, stop, restart, and enable services on Windows and Linux while using logs and status output to verify the result.

Inspect running processes, identify PIDs, and connect a few basic commands to the process model without needing advanced process theory yet.

Understand basic process signals and practice stopping harmless processes with a preference for gentler signals first.

Understand what systemd is responsible for and practice basic service inspection before attempting custom service creation.

Use top and htop to inspect CPU and memory usage, sort active processes, and stop a disposable practice load.