D&D Examples: I want to punch the thing! (roll attack, roll damage). I want to lie to someone! (roll skill versus skill). I want to become invisible! (cast a spell, mark it off your spells per day, roll nothing).
Fate examples: I want to punch the thing! (roll skill against a static number, or active defense). I want to lie to someone! (roll skill against a static number, or active defense). I want to become invisible! (roll skill against a static number, or active defense).