Turtle bot runs on the ROS platform so you will need a basic understanding of how ROS works. You can go through the ROS tutorials to get a flavour of how ROS works. Working with turtle bot after going through the tutorials should not be very difficult. There are sme tutorials which are based on the turtle bot itself. There is also a lot of support from the community. You can post questions here about anything you dont understand or about the errors that you might face during your experiments.