You can put a Linux laptop or netbook in hibernate or suspend mode by using the systemctl command.
To put the system in hibernate mode, run the following command as root or with sudo:
systemctl hibernate
To put the system in suspend mode, run the following command as root or with sudo:
systemctl suspend
Note that not all Linux distributions support both hibernate and suspend modes. You should check the documentation for your specific distribution to determine which modes are supported and how to use them.
Additionally, the exact method for putting a Linux system in hibernate or suspend mode may vary depending on the distribution and the hardware configuration. If the above methods do not work for your system, you can try searching the documentation or forums for your specific distribution for alternative methods.