Try exploring your files system by using 'ls' to list the files in the current directory and 'cd' followed by a directory name to change the current directory.
You can edit files using 'nano' followed by the file name and also install software using the 'apt-get' command, as described in some of the earlier tutorials in this series.
When finished with your ssh session, close the client application/window or simply type in exit into the shell window.
If you encounter a connection reset by peer error when trying to connect to your Pi, there could be a problem with the SSH keys. You can 'reset' the keys with the following commands.First, remove the old keys:
sudo rm /etc/ssh/ssh_host_*
Then regenerate them
sudo dpkg-reconfigure openssh-server
Then try again!