Is there some kind of logic behind spell slot progression?

Most levels that see an increase in spell slots give you about levels of spells per level Levels 1, 3, 5, and 9 give you more Levels 12,

Is there some kind of logic behind spell slot progression? 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,

Most levels that see an increase in spell slots give you about levels of spells per level Levels 1, 3, 5, and 9 give you more Levels 12,

wizard of oz emerald city slot machine This lets you recover a number of spell slots on a short rest, as long as those spell slots have a combined level that is equal to or less than half your Wizard

If you have more than one spellcasting class, this table might give you spell slots of a level that is higher than the spells you know or can

wizard of oz free slot machines Cleric spells were expanded to 7th level and wizards spells to 9th, creating the spell's level or higher, effectively 'filling' a slot with the spell

Casting spells consumes spell slots Lvl 1: You gain 2 level 1 spell slots, which are restored on a long rest Lvl 2: You gain 1 level 1