There are some materials that you might want to start collecting before Version 1.5 is released. This article will list the materials you need for Yanfei and Zhongli on the upcoming banner, as well as the materials required for the crafting of furniture in the housing system. 

For all the enemy materials required, you can refer to the MiHoYo official map of Teyvat here, where you can see the location of various enemies throughout the map. Although the map is in Mandarin, there are icons next to the words to help you easily identify what you're looking for. You can also use this map to find the specific locations of Local Specialties and you can read my guide on routes for obtaining certain specialties here. Alternatively, you can use the book in your game itself to search for specific enemies. 

Yanfei

These are all the required materials for Yanfei's build. You can get Raven Insignias from Treasure Hoarders and the Agnidus Agates from defeating the Pyro Regisvine. The Crown of Insight can be purchased from events, including the upcoming Energy Amplifier event that you can read more about here. The Juvenile Jade is earned through defeating the Primo Geovishap boss, giving 2 or 3 each time at higher levels. The Bloodjade Branch, however, is currently unavailable in the game. The Bloodjade Branch will be given after defeating the new weekly boss, Azhdaha. Talent books (Gold) can be obtained from the Taishan Mansion domain on Wednesday, Saturday and Sunday. 

Zhongli

These are all the required materials for Zhongli's build. You can get Slime Condensate from all slimes and the Prithiva Topaz from defeating the Geo Hypostasis. The Crown of Insight can be purchased from events, including the upcoming Energy Amplifier event that you can read more about here. The Basalt Pillars is earned through defeating the Geo Hypostasis as well, giving 2 or 3 each time at higher levels. The Tusk of Monoceros Caeli will be given after defeating Tartaglia in the weekly Golden House challenge. Talent books (Gold) can be obtained from the Taishan Mansion domain on Wednesday, Saturday and Sunday.