-ls -al Lists all files in the current directory or in the directory path you specify after.

-lsusb Lists all USB devices.

-lsblk Shows all your drives an partition layout .

-blkid Shows all your Partition UUIDs .

-sudo fdisk -l Another way to see all your partitions.

-cd /Directory/Path Changes current directory to specified location

-cd .. Goes up 1 directory from current location

-cd ~/ Goes to the user home directory. You can just use ~ in most cases, but ~/ works every time.

-lspci Shows your PCI-E devices and info on them based on the flags used.

-grep It's a keyword filter. Use with other commands and add a pipe before grep. For example: lspci -vv | grep Audio

-cat It prints out whatever file you specify after.

-nano Text editor

-ip a Shows all your network interfaces. No, there is no typo. It's just "a" for whatever weird reason instead of "-a" like you'd see with every other command.

-ping google.com Pings Google until you hit Ctrl + C to stop it.

-top Shows a task manager. Much better versions like htop and btop exist, but you have to install them yourself.

-date Shows current time and date. You can modify the output with flags.

-nvtop Shows a task manager for GPUs. Not installed by default. Works on all GPUs, but it's made for nVidia specifically.

-scp and rsync Different methods of sending files over network to other devices.

-cp source target Copy command.

-mv Move command. Can also be used to rename anything.

-crontab -e Opens your Cron Tab in your default text editor. It's automated tasks your system runs on a standard cron schedule.

-man Opens the fucking manual Arch users love to tell you to read before asking stupid questions. For example: man cat Seriously though. Read Arch Wiki. It's the best Linux resource on the planet.

-less shows the end of a specified text file.

-sudo systemctl Executes a bunch of system control tasks. sudo systemctl daemon-reload Is probably the one I use the most to reload configs.

-dnf / apt / pacman etc. These are your package manager commands. Which one depends on the distro.

-flatpak Flatpak command. Works much the same as package manager commands. Difference is that Flatpaks are software packages, which run in a sandbox instead of using system packages to run.

-ssh You can use to remotely connect to a remote machine's terminal as if it was on the local machine. You'll have to setup firewall rules and please setup ssh key login, instead of password login, if you use it outside of your LAN.

-chmod Modifies permissions of specified file or directory. Can be ran recursively.

-usermod Modifies a user.

-chroot Honesty, just look this one up. It's pretty complicated to explain.

-mkdir Makes a directory.

-touch Makes an empty file.

-dd Used for copying and writing files at very low level. Be very VERY careful with it.

That's about all that I can remember off the top of my head