Could be the book you loved the most, the series you daydreamed about, book that inspired you, fascinated you, your comfort read…anything.
And why.
I LOVED the Anne McCaffrey Pern books. I would walk around daydreaming about new adventures set in the books’ world. The Dragonsong books really connected my love of music with my love of fantasy (and animals).
Animorphs- I had a childhood with pretty terrible circumstances at a few points and these kids had it way worse yet still managed to be brave, and lean on each other as much as they could. And sometimes things still wind up pretty shit, even when you try really hard, but you fought your damnedest and gave it your all and when you do that, fuck it. You gave it everything you had and you can own it.
After that, Xanth by Piers Anthony. It was/is stupid and silly and weirdly thirsty but in a way that didn’t take itself seriously. It was a good-natured ribbing of the early sword and sorcery genre and I ate that shit up.