You can buy four Hollow Knight Charms notches from her, and each of them has requirements as follows: Here, you can buy many different items, but for all intents and purposes, we are only here for the charm notches. When you go here, you will be able to enter Salubra’s shop. Those eight notches can be found in the locations shown below. You start the game off with three notches, and you find eight more along the game.
This is why most charms you find will have an average notch requirement of 3 or 4. You can not equip charms that exceed your maximum weight capacity. Think of notches as your maximum carry weight for charms, and each charm has a different weight. Now, to use charms, you need Hollow Knight Charms notches, which can be found throughout the game and used to increase your charm usage.
You equip the charm to your character with the select button (the middle left button on mist controllers or Tab on keyboards).
It can be made into a three-step process:
The way to use charms is actually pretty simple.