The days of two genders – male, female; boy, girl; blue, pink – are over, if they ever existed at all. Gender is now a global conversation, and one that is constantly evolving. More people than ever before are openly living their lives as transgender men or women, and many transgender people are coming out as neither men nor women, instead living outside of the binary. Gender is changing, and this change is gaining momentum. We all want to do and say the right things in relation to gender diversity – whether at a job interview, at parent/teacher night, and around the table at family dinners. But where do we begin? From the differences among gender identity, gender expression, and sex, to the use of gender-neutral pronouns like singular they/them, to thinking about your own participation in gender, this serves as ‘a warm, inviting guide to a complicated area’.