Looks like Cory Klein has made all his chess books free again.
Chess: The Ultimate Guide for Beginners – A Comprehensive and Simplified Introduction to the Game of Chess (openings, tactics, strategy)
Chess Openings for Beginners: A Comprehensive and Simplified Guide to Chess Openings
Chess Middlegame for Beginners: The Complete Tactics and Strategy Guide for Beginners
Chess Endgame for Beginners: The Complete Beginner’s Guide to Delivering Checkmate
Chess Games of Legends: 20 Legendary Grandmaster Games Narrated, Illustrated, and Analyzed.
Been watching Queen's Gambit on Netflix, does any of these book has the Sicilian strategies?