Primarily an uncountable noun referring to the act or process of educating oneself.
Through self-education, he mastered three languages.
Благодаря самообразованию он освоил три языка.
Used attributively before another noun (e.g. self-education course). Relational, not normally comparable.
She downloaded several self-education tutorials.
Она скачала несколько самообразовательных пособий.