https://www.gamespot.com/articles/destiny-2-raid-guide-leviathan-walkthrough-and-tip/1100-6453311/

Destiny 2's first Raid is already live on consoles, and it's about to launch on PC. Titled Leviathan, this debut Raid for Destiny 2 is comprised of puzzles, challenging encounters, and boss fights. Navigating it all without any assistance can be seriously difficult, so we've rounded up tips and a walkthrough for the entire Raid, as well as details on how to access it. Take note that each weekly reset shuffles the order of three major encounters in the Raid, so the exact order in which you encounter the Royal Pools, Pleasure Gardens, and Gauntlet will vary from week to week..