Build a database from scratch in rust

Hi, I have coded some very small applications using rust and am newbie in rust but I have been trying to read this book https://build-your-own.org/database and start implementing it step by step in rust, but I feel I don't understand it well, and I am not sure that it's dumb to suddenly fall myself in such complex topic, my goal is to becoming from being a frontend engineer to software engineer and as I love rust language I started coding in it, so I will be glad if anyone could give me some clue, thanks.