If you are new to the series, reviewers and fans often suggest these entry points:
Begins with Mirage , which serves as a shorter "homage" to the stealth-focused roots of the original games. Mainline Games in Order
Focuses on social stealth, parkour, and counter-based combat. Key titles include the original Assassin's Creed and the fan-favorite Ezio Trilogy ( ACII , Brotherhood , and Revelations ).