At the end of this chapter, you should have a robot—simulated or real—moving autonomously through the map (which models the environment) using the navigation stack. You can program the control and the localization of the robot by following the ROS philosophy of code reusability, so that you can have the robot completely configured without much effort. The most difficult part of this chapter is to understand all the parameters and learn how to use each one of them appropriately. The correct use of them will determine whether your robot works fine or not; for this reason, you must practice changing the parameters and look for the reaction of the robot.
In the next chapter, you will see some robots that you can download and simulate on ROS. These robots have 3D models and they can be used in Gazebo for simulation. Some of them have the navigation stack implemented, and you will learn how to use it and play with them. It should not be a problem for you because you have all the knowledge...