Talents are magic powers innate to a person. Other common magic draws on an external source--a daemon, spirit, or essence that is present in the mortal world. Talents do not draw on any external source--they come entirely from within yourself.
So talents aren't "common magic" in general--they're "common magic other than spells, charms, and feats". And they're explained in the rules--they just don't take much in the way of explanation, since they're pretty simple.
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