For the usage of the Targit platform, all the official documentation can be found online at https://confluence.targit.com/display/2019doc/2019+Documentation.
On this page you can follow the official courses and read the latest news about the new features.
We recommend you start with the Quick Tutorial and then proceed to the Targit Fundamentals Course to get the basics down of the use of the client.
You can follow all courses on the site as the entire demo set of Targit is available in your client.
An additional source of interesting short training video's is the Targit Youtube Channel. It contains short video's illustrating the functionality of the client and tips & tricks.