Security Setup Video

Just in case anyone else gets stuck with this. In the Security Setup video at around the 4 minute mark when it talks about tighten up security by making some changes to the sshd_config file you need to type sudo nano /etc/ssh/sshd_config whilst logged into your user account and not nano /etc/ssh/sshd_config otherwise when saving the file you will get a permissions denied.

Had me foxed for a while so hope it helps someone else.

Cheers