I'm new to D&D. I am playing a Level 4 Half-Elf Bard. I don't understand how modifiers work or how they change as I level up, or how they affect other character details.
I've picked new spells and I've chosen a new cantrip. At Level 4, I could increase an ability score. I increased my Charisma from 17 to 18, so now I have a
+4 modifier. I can see that my Bard spells rely on Charisma: how do my Spell Save DC (currently 13) and Spell Attack Bonus (currently
+5) change as a result of the increase in Charisma?
Since I am a new player, I would appreciate detailed answers that spend time on the basics.