The Linux Operating System

Just like Windows, iOS, and Mac OS, Linux is an operating system. In fact, one of the most popular platforms on the planet, Android, is powered by the Linux operating system.

Also, Linux is distributed under an open source license.

Components

The Linux operating system comprises several different pieces:

Bootloader: The software that manages the boot process of your computer. For most users, this will simply be a splash screen that pops up and eventually goes away to boot into the operating system.
Kernel: This is the one piece of the whole that is actually called Linux. The kernel is the core of the system and manages the CPU, memory, and peripheral devices. The kernel is the lowest level of the OS.
Init system: This is a sub-system that bootstraps the user space and is charged with controlling daemons. One of the most widely used init systems is systemd, which also happens to be one of the most controversial. It is the init system that manages the boot process, once the initial booting is handed over from the bootloader (i.e., GRUB or GRand Unified Bootloader).
Daemons: These are background services (printing, sound, scheduling, etc.) that either start up during boot or after you log into the desktop.
Graphical server: This is the sub-system that displays the graphics on your monitor. It is commonly referred to as the X server or just X.
Desktop environment: This is the piece that the users actually interact with. There are many desktop environments to choose from (GNOME, Cinnamon, Mate, Pantheon, Enlightenment, KDE, Xfce, etc.). Each desktop environment includes built-in applications (such as file managers, configuration tools, web browsers, and games).
Applications: Desktop environments do not offer the full array of apps. Just like Windows and macOS, Linux offers thousands upon thousands of high-quality software titles that can be easily found and installed. Most modern Linux distributions (more on this below) include App Store-like tools that centralize and simplify application installation. For example, Ubuntu Linux has the Ubuntu Software Center (a rebrand of GNOME Software) which allows you to quickly search among the thousands of apps and install them from one centralized location.

Linux Scripts

Running Scripts at Startup

One approach is to add an @reboot cron task:
1. Running crontab -e will allow you to edit your cron.
2. Adding a line like this to it: @reboot /path/to/script will execute that script once your computer boots up.
The upstart system will execute all scripts from which it finds a configuration in directory /etc/init. These scripts will run during system startup (or in response to certain events, e.g., a shutdown request) and so are the place to run commands that do not interact with the user; all servers are started using this mechanism.

You can find a readable introduction to at: http://upstart.ubuntu.com/getting-started.html.

The man pages man 5 init and man 8 init will give you the full details.

Linux Applications

Text Editors

kate: heavy on resources
featherpad: has fewer features than kate, yet some pleasant coincidences
bluefish
notepad++
other text editors