Burning Hands
A thin sheet of flames shoots forth from you. Each creature in a 15- foot Cone makes a Dexterity saving throw, taking 3d6 Fire damage on a failed save or half as much damage on a successful one. Flammable objects in the Cone that aren't being worn or carried start burning.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 1.
Burning Hands 5e 2024 vs. 2014 edition differences
Both versions deal 3d6 fire damage in a 15-foot cone with a Dexterity save, increasing by 1d6 per spell slot above 1st. The 2024 version clarifies the damage increase wording and simplifies the description; no significant mechanical differences are present.