This chapter is intended as an introduction to basic usage of jabber.el. If you have used Jabber before and are familiar with the terminology, you might find it a bit too basic — in that case, just skim it, making sure to pick up the commands mentioned.
There are a handful of global keybindings for common commands. They start with C-x C-j, and you can get a list of them by typing C-x C-j C-h.