Find a hairstyle that says "grown up"

Frankel's super-important hair advice: DO NOT play with your hair. That means twirling it around your fingers, flipping it out of your face, running your hands through it, whatever. Touching your hair makes you look immature. Kind of the opposite of what most interviewers are looking for.

The easiest way to avoid touching your hair: wear it back. On the next slide, Brown shares a perfectly polished look that fits Frankel's request.