How should a father explain puberty to his daughter?

Like everything else, be as honest and as practical as you can. My best friend's dad is a single dad and he taught my bestie everything she needed to know when she went through puberty --- menstruation, boy-girl relationships and even picking out the right bra. Most of them he read from parenting books and the rest, he asked his sisters and female friends. My friend shared that her dad was always scientific with the uncomfortable body related topics but kind with the more emotional ones like boyfriends etc. Whatever he couldn't handle, he'd enlist the help of his sisters.