useState 동작원리 https://velog.io/@jjunyjjuny/React-useState%EB%8A%94-%EC%96%B4%EB%96%BB%EA%B2%8C-%EB%8F%99%EC%9E%91%ED%95%A0%EA%B9%8C
소설을 읽어야하는 이유 https://1boon.kakao.com/changeground/novel_180226
