Quick Select is the system in which items like Potions, Food, and Bombs are selected for use in your "quick item slot" bound to your "Q" key. This menu is opened by pressing tab. Once in the quick select menu, press A or D (left and right, respectively) to select an item. Once an item is inside the brackets at the top of your screen, it can be used by pressing Q. For instance, food can be consumed by pressing Q, causing your character to sit, eat, and heal. Pressing Q to use potions activates a channeled action, healing your character and allowing you to move about, and pressing Q for Bombs creates a "pet" that loses HP over time until it reaches 0 and blows up, damaging anything in its radius (so stand back!).