Linux for newbies. There are tutorials and online terminals such telnet, ssh or java telnet client. Using one of these clients you can login to remote virtual machine by root user and start practicing your sessions from the tutorials.
The site is http://linuxzoo.net
Need to Register and Login to account
The join the queue and switch on the system.
Once you get the run or completed prompt,
Go to connect and copy the url/ip to your telnet client.