> For the complete documentation index, see [llms.txt](https://olb.gitbook.io/linux-essentials-certification/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://olb.gitbook.io/linux-essentials-certification/4.linux-operating-system.md).

# 4.Linux operating system

- [4.1 Choosing an OS](https://olb.gitbook.io/linux-essentials-certification/4.linux-operating-system/4.1-choosing-operating-system.md)
- [4.2 Understanding hardware](https://olb.gitbook.io/linux-essentials-certification/4.linux-operating-system/4.2-understanding-computer-hardware.md)
- [4.3 Where data is stored](https://olb.gitbook.io/linux-essentials-certification/4.linux-operating-system/4.3-where-data-is-stored.md)
- [4.4 Networking](https://olb.gitbook.io/linux-essentials-certification/4.linux-operating-system/4.4-your-computer-on-the-network.md)