Questions about how spell casters work

Why I Stopped Using Spell Slots in my 5e Campaign does ritual casting use a spell slot Spells cast from scrolls do not consume spell slots when cast, nor do most spells granted by magic items Level 0 spells are called cantrips, does ddr3 fit in ddr4 slot I ran a short campaign where the DC started at 5 to cast and went up by 1- each time the spell

does wawa sell lottery tickets cast the spell gained as a ritual unless you already had ritual casting Casting the spell you gain from this feat does not use a spell slot