If you really have no idea how this works, then you probably are out of your depth. This is not a very complicated amplifier circuit, but it does use several different circuit concepts: input differential amplifier, common emitter voltage amplifier, active zener, complimentary-symmetry output stage, bootstrap current source, and negative feedback. If you don't understand at least the basics of how these functions work, an overall explanation of the amplifier probably will not tell you much.
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