Remote terminal access with tmate
tmate is a great tool to remotely let access to someone else in a terminal. This is particularly useful for third party support.
To allow access on a terminal on the raspberrypi follow these steps below.
First install tmate
sudo apt-get install tmate
Then generate keys. Press return when prompted.
ssh-keygen -t rsa -b 4096
At the bottom of the terminal an address will appear. Give this address to anyone you are allowing the access to the terminal.