Some kindergartens, like the one my kid studying in, teaches phonics to kids. They keep learning bit by bit day by day. This is much more powerful than phonics course one or two hours per wk ~> Total waste money for very small kids. I also learn much from the phonics books my kid brought home from school.
E.g. "When 2 vowels come together, the first does the talking." This is a rule which I never came across thorughout my life at school (even in university) !