Start with this
Open the Areas button on the right side of the screen. That menu is the hub map: Summon Area for banners, Upgrade Area for unit investment, Trait Reroll for the NPC station, and Random Shops & Merchants for rotating purchases. Community walkthroughs also name a Units & Elements area. Story, Infinite, and Raids are game modes, not hub rooms — pick a mode after you know which station you need. Only Fire and Neutral are confirmed elements so far; a full typing chart has not been published.