Julia Documentation, The Julia Language Developers, 2024 - The official and most authoritative source for the Julia programming language, covering all core syntax elements.
Think Julia: How to Think Like a Computer Scientist, Ben Lauwens and Allen B. Downey, 2019 (O'Reilly Media) - An excellent introductory book that teaches foundational programming concepts using Julia, including basic syntax and structure.
Julia Programming for Engineers and Scientists, Alan Edelman, David P. Sanders, and Charles F. Van Loan, 2021 (Society for Industrial and Applied Mathematics (SIAM)) - Authored by one of Julia's co-creators, this book provides a rigorous introduction to the language, starting with its fundamental syntax.