The following documents also contain related information:
Basics of Operational Amplifiers and Comparators
Why is feedback used in op-amps?
What are open-loop and closed-loop gains of an op-amp?
What is the purpose of using a differential amplifier? (Common-mode rejection ratio: CMRR)
What is the input offset voltage of an op-amp?
What is the maximum frequency at which an op-amp can be used?
Is there any way to amplify a signal with a voltage close to the power supply level?
What types of noise affect an op-amp?
Are there any considerations for using an op-amp at low voltage?
What is the common-mode input voltage of an op-amp?
What does rail-to-rail mean?
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Operational Amplifiers and Comparators