Baldur's Gate 3 will have you and your party facing down all sorts of monsters throughout your journey. Each fight can be quite draining, having you use spells for healing or fighting, along with any bonus abilities you can only use once a day.
Baldur’s Gate 3: What Are Short & Long Rests
Short & Long Rests are easy ways of recovering your HP and getting back your spells; here's what they are & how they are different.