This is American's terminal at PHX. It's easy to navigate; it's just four concourses connected by an extremely long connecting hallway with moving sidewalks.
It can still be a significantly long walk if you arrive at one end of the terminal and leave from the other end.
There are several Admirals Clubs here, and public WiFi is available and free of charge.
Food options vary from concourse to concourse, but there some familiar names like Pei Wei and McDonald's.
The terminal itself is not going to win any style awards and is fairly dated. It has a bit of a claustrophobic feeling and doesn't feature much natural light. It is billed as the friendliest airport in America, though. I'm not sure who gave it that title...