The inventory is where you keep all your crafted items; it is also where you can view any unlocked blueprints and check your mastery progress on them.
If you have an item to which you do not have the blueprint, you can also view it here, however the information will be limited and you will be met by a "Discover the blueprint to unveil all the information!" message.
If you have an item that comes from a chest, but you do not have the blueprint, it will tell you which chest the item came from.
Tap the button that is marked in the image below to access the inventory.
- Tap the button that is marked in the image below to see what items are currently in your inventory
- Tap any button within the rectangle that is marked in the image below to see what blueprints / special resources you currently have unlocked
- Tap the button that is marked in the image below to see what chests / keys you currently have