This page can be used to track your progress in collecting and upgrading all armor pieces in The Legend of Zelda: Tears of the Kingdom. Naturally, this means the page will contain spoilers!
On the left is a list of all armor pieces in the game, click on an armor piece to mark it as collected. For upgradable armor pieces, click on a specific level to mark it as having been upgraded to that level. The number in parentheses behind a material's upgrade cost is theremaining number of that material required to fully upgrade all armors. To mark a collected armor piece as uncollected, click on the level it's currently set to.
On the right is a table with all the materials required for armor upgrades. It shows how many of each material are required to upgrade every piece of armor to a certain level. As you level up your armor, the remaining material costs will decrease accordingly. You can also click on a row to manually mark it as completed(when have enough of a material in your inventory, for example).
At the top of each section is a search bar that allows you to filter by name, with two buttons beside it for additional options and filters.
These instructions will show up any time you visit this page, check this box to only show them when you haven't visited in a while. Understood!