Your Horizon zero Dawn guide

Horizon Zero Dawn is an action role-playing video game developed by Guerrilla Games and published by Sony Interactive Entertainment for the PlayStation 4. The game was released worldwide in 2017.
The plot revolves around Aloy, a hunter and archer living in a world overrun by robots. Having been cloistered her whole life, she sets out to discover the dangers that kept her sheltered. The character makes use of ranged, melee weapons and stealth tactics to combat the mechanised creatures, whose remains can also be looted for resources. A skill tree facilitates gameplay improvements. The game features an open world environment for Aloy to explore, divided into tribes that hold side quests to undertake, while the main story guides her throughout the whole world.
Development began in 2011. Mathijs de Jonge, the game's director, considered it "the most risky" idea of those that were pitched. The concept explores the contrast between the beauty and danger of the game's setting. Guerrilla Games emphasises trial and error as the basis for playing the game, choosing not to implement a tutorial. The game engine, Decima, was previously engineered for Killzone Shadow Fall and altered for Horizon Zero Dawn, the first intellectual property (IP) developed by Guerrilla Games since Killzone in 2004, and also the studio's first attempt at developing a role-playing game.

Horizon Zero Dawn is an action role-playing game played from a third-person view. Players take control of Aloy, a huntress and archer, as she progresses through a post-apocalyptic land ruled by robotic creatures known simply as "Machines".
Machine components, such as electricity and the metal they are composed of, are vital to Aloy's survival, and she can loot their corpses to find useful resources for crafting.Aloy uses a variety of ways to kill enemies, such as setting traps like tripwires using the Tripcaster, shooting enemies with arrows, using explosives, and melee combat. Weaponry and traps may be purchased from traders. Further, she is essentially able to hack a selection of creatures with the Override Tool, turning them into makeshift vehicles or travelling companions.

Horizon Zero Dawn recently received criticism for its portrayal of different tribes represented in the game and four words used to describe those people: savages, braves, primal and tribes.
So this app is not an official guide or at all associated with the game's developer or publisher