How do Spell Slots work in D&D 5e?

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The Wizard table shows how many spell slots you have to cast your spells of 1st level and higher To cast one of these spells, you must expend a

If you have three spell slots, you can cast the same prepared spell over and over again Cantrips are considered 0th level spells You have a The way I'm reading it, you can leave slots open and fill them when you might need a spell You can't change a spell slot until you take a long

magic mirror slot machine Spell Slots Table: The Wizard shows how many spell slots you have to cast your spells of 1st level and higher To cast one of these spells, you must expend a slot of the