Is sshd really not part of systemd?

Yes, it’s not a part of systemd. By running systemctl restart sshd you are just restarting the sshd systemd service. Systemd service files for things like ssh and transmission come with their respective packages.

You can see what I mean here. The openssh-server package for Ubuntu comes with the sshd.service file.

It has a dedicated eclipse drawing tool.

The PCs at my college has only 4GB of RAM with Windows 10. I hate having to use them cause they are so slow.