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You need to source your environment.

source /opt/ros/YOUR_ROS_DISTRO/setup.bash or .zsh or.sh depending on your shell.

Also, before you try something within your workspace, you need to source the setup files in your devel folder, same logic as above:

source CURRENT_WORKING_WS/devel/setup.bash or .zsh or.sh depending on your shell.

You need to source your environment.environment before you try to use ROS.

source /opt/ros/YOUR_ROS_DISTRO/setup.bash or .zsh or.sh depending on your shell.

Also, before when you try something within your workspace, you need to source the setup files in your devel folder, same logic as above:

source CURRENT_WORKING_WS/devel/setup.bash or .zsh or.sh depending on your shell.

You need to source your environment before you try to use ROS.

source /opt/ros/YOUR_ROS_DISTRO/setup.bash or .zsh or.sh depending on your shell.

Also, when you try something within your workspace, you need to source the setup files in your devel folder, same logic as above:

source CURRENT_WORKING_WS/devel/setup.bash or .zsh or.sh depending on your shell.

See this for more info :

www.ros.org/wiki/ROS/Tutorials/InstallingandConfiguringROSEnvironment

You need to source your environment before you try to use ROS.

source /opt/ros/YOUR_ROS_DISTRO/setup.bash or .zsh or.sh depending on your shell.

Also, when you try something within your workspace, you need to source the setup files in your devel folder, same logic as above:

source CURRENT_WORKING_WS/devel/setup.bash or .zsh or.sh depending on your shell.
CURRENT_WORKING_WS/devel/setup.bash

See this for more info :

www.ros.org/wiki/ROS/Tutorials/InstallingandConfiguringROSEnvironment