Rust, through the borrow checkerDedicated page
Start this stepStartThree sections. Fundamentals covers variables and mutability, shadowing,match, loops, functions, arrays and mutable references; Logic & Flow covers vectors, structs, hash maps, Option, Result and the ? operator, string slices and closures; Object Oriented Programming covers what that means in Rust (methods on structs, modules and privacy, enums with data, generics, traits, trait bounds and trait objects) and patterns such as newtype and From and Into. Ownership and borrowing run through all three and are the hard part: the compiler refuses code other languages would run. Learn them deeply; every later step depends on them.StartDedicated page