TLDR

rpm -qa # list all installed packages
dnf check-udpate # update/synchronize software repositories
sudo dnf update # upgrade all installed packages
dnf search <package_name> # search for package
sudo dnf install <package_name> # install package
dnf list installed # list all installed packages
dnf info installed # list all installed packages along descriptive info
dnf info <package_name> # show descriptive info of package
sudo dnf remove <package_name> # uninstall package

sudo useradd <username> # creates a user
sudo userdel -r <username> # deletes a user (-r deletes the user's home directory)
sudo usermod -aG wheel <username> # enables user to escale to root
sudo passwd <username> # changes user password
sudo su - # change to root user
su <username> # change to user with <username>

sudo systemctl start <service> # starts a service
sudo systemctl stop <service> # stops a service
sudo systemctl restart <service> # restarts a service
sudo systemctl enable <service> # enables a service to start on boot
sudo systemctl disable <service> # disables a service to start on boot
sudo systemctl list-units --type=service # list all services with their status

ps -axf # show process tree
pidof <p_name> # get process ID given a process name
kill -<int> <pid> # kill process with signal <int>
pkill <p_name> # kill processes associated with <p_name>

ip a # show internet info
ss -tulnp # display listening TCP and UDP sockets with numeric addresses, ports and associated PID's.

ls -ltrha # list all files (hidden too) under CWD with long listing format, sorted by newest modified, printed in reverse order, with human readable sizes
cd - # cd to previous directory
cd # cd to home
rsync -avz <source> <target> # copy files from source to target
rsync -avz <source> <user>@<ip>:<target> # copy files from source to target directory of another machine over ssh
tar --use-compress-program=<compress_program> -cf <compressed_archive_name> <source> # archive and compress source into file <compressed_archive_name>
pwd # prints current working directory