People who are self-educated have acquired knowledge or a skill by themselves, rather than being taught it by someone else such as a teacher at school.
...a self-educated man from a working class background.
ADJ
SELF-EDUCATED
Meaning of SELF-EDUCATED in English
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006