Generic, Table: Spell Slots

Spell Slots

usually:
Spell save DC = 8 + your proficiency bonus + your spellcasting modifier
Spell attack modifier = your proficiency bonus + your spellcasting modifier
 
Can change spells per day: Cleric, Druid, Wizard, Paladin, Artificer
Preparing a new list of spells requires time spent in prayer and meditation: at least 1 minute per spell level for each spell on your list.
 
Otherwise when you level up in a spellcasting class you can choose one of the spells you know and replace it with another spell from the spell list, which also must be of a level for which you have spell slots.