IPA: /ˌɔːtəʊdaɪˈdæktɪk/
KK: /ˌɔːtəʊdaɪˈdæktɪk/
Describing someone who has learned a skill or subject on their own, without formal education or a teacher.
She is an autodidactic artist who learned to paint by watching online tutorials.
Autodidactic is formed from "auto-" (meaning self) and "didaktikos" (from Greek, meaning teaching or instructive). The word describes a person who is self-taught, learning independently without formal instruction.
Think of 'self' ('auto-') learning or teaching ('didaktikos') — that's what autodidactic means.