Graeme explains the basic usages of op amps. How to hook them up in various circuits. Plus the common properties that parameterise a given op amp. Like transconductance, transimpedance, common mode rejection ratio and the minimum stable gain.
Probably the two most important modalities get a chapter each. On using an op amp for voltage gain, and for current gain. En route, you can see how easy it is to hook up an op amp as an inverting or non-inverting amplifier.
There is no significant modelling of the inside of a transistor. Black box. So the discussion is independent of whether you have a bipolar or CMOS device. And this lets the text avoid explaining given models, like the Ebers-Moll for a bipolar.