- Distributions: Debian, RHEL, Suse, Arch
- Basic terminal operations
- pwd, cp, ls, touch, cp, mv, rm, mkdir, nano, grep, cat
- less, w, top, free, su, file, which, ip a, uname, man
- Flags and OPerators: |, &&, >, >>
- Directories: var, etc, bin, home
- Permissions: chown, chmod
- Package Managers: apt, yum, linuxbrew
- Web servers: apache2, nginx
- Read Logs, EtcInitD, Services
- Shells: sh, bash, zsh
- Scripting: bash, python
- cronjobs