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Technically most spontaneous casters would be self taught, but really anyone could be self-taught. Oracles are suddenly cursed and given power, so they have to learn their magic themselves.
Sorcerers are born with their magic, even if their family doesn't have magic, often leaving them to learn it themselves.
Bloodragers are similar, except the 'magic' bit is weaker than a sorcerer.
Magical Child Vigilante has their magic instilled through a familiar bond that they might not be familiar with.
Psychics could just gain their powers one day.
Spiritualist could just become a patron to a wandering spirit one day.
Summoner could have accidentally formed a pact with an eidolon and that's where they develop their magic from.
All in all "self-taught" could just be spells chosen at early levels to be 'quality of life' spells. Wizard studies magic such as Preserve to keep their food fresh. Ears of the City to keep up to date with current events without having to go outside. Unseen Servant to help with basic chores like sweeping or dusting. Etc.