First page of chapter 1. Are they going to tell us what trans is? Well not really, if you feel a bit different you're trans, basically. Or, you're trans if you want to be. Everybody welcome! (Just not those awful cis people, but you wouldn't want to be one of them - would you? But I'm jumping ahead, that comes later... )
Let's try to figure out what being trans actually is and what it actually means.
Sounds promising - yes, a definition please! Oh but sorry, my mistake, definitions are bad, apparently...
The trouble with providing definitions and ticking boxes is that it leads to oversimplification. There isn't a single definitive answer to the question of what it means to be trans, because there is no one way to be trans! There are so many trans people and they are so diverse that there isn't a universal experience that is more trans or truly trans.
Gender is a complicated social construct, and trying to define it, or people within it, is quite hard! So let this be a guide - or an offering of possibilities - to what it might or might not mean to you. But just remember that ultimately it's you who defines who you are, whether that's as a trans person or not. The short answer, though is this: Trans people are people who don't identify with the gender that they were assigned at birth
They continue into the "long answer" which includes a load more waffle, such as
"It's a bit like you signed up for a French Class, but when you got there everyone is speaking Spanish. Something just isn't the way it should be. So, essentially, being trans means you aren't actually the boy or girl everyone seems to think you are, It means that your inner sense of self - your gender identity - is something different. Whether it's that you're actually a girl, or a boy, or a non-binary (people who aren't fully boys or girls), and the main thing is that you're not what most people think you are."
"Something just isn't the way it should be. So, essentially, being trans means you aren't actually the boy or girl everyone seems to think you are," Doesn't that just describe teenage angst?! They're trying to welcome in ever kids who feels a bit different, aren't they?
Nowhere (as far as I can see so far) does it say - feeling different from other people and unsure of your body is a NORMAL part of puberty as is rejecting gender norms. It doesn't mean you're trans!