Lyney & Lynette can be seen in the Mihoyo official Genshin trailer, and expected to be appearing in Act IV, Masquerade of the Guilty in Fontaine region.
Puzzles, Secrets, and Hidden Chests in Liyue
Scaramouche
Ragged Records Hidden Quest Guide
Puzzles, Secrets, and Hidden Chests in Dragonspine
Violetgrass Farming Map
Treasure Lost, Treasure Found Quest Guide
How to Farm Character Ascension Materials