This book mainly describes the basic grammar of Rust.

Foreword

It wasn't always so clear, but the Rust programming language is fundamentally
about empowerment: no matter what kind of code you are writing now, Rust empowers
you to reach farther, to program with confidence in a wider variety of domains
than you did before.

Take, for example, "systems-level" work that deals with low-level details of memory
management, data representation, and concurrency. Traditionally, this realm of
programming is seen as arcane, accessible only to a select few who have devoted the
necessary years learning to avoid its infamous pitfalls. And even those who practice
it do so with caution, lest their code be open to exploits, crashes, or corruption.