Spellcasting modifiers

Spell Save DC

8 + proficiency bonus + spellcasting ability modifier

Spell Attack Modifier

proficiency bonus + spellcasting ability modifier

Player's Handbook, page 101, Player's Handbook, page 107, Player's Handbook, page 114, Player's Handbook, page 53, Player's Handbook, page 58, Player's Handbook, page 66, Player's Handbook, page 75, Player's Handbook, page 85, Player's Handbook, page 92, Player's Handbook, page 98