As with any game, especially a complex one, there's going to be questions about how the rules work and different interactions between them. And with a game like Dungeons & Dragons, those interactions can get rather complex, indeed. Well, WotC is here to help. They've updated their Sage Advice Compendium to give you all the info you need to make sure you're playing the game with the rules as intended.
From the post:
We gather some of the most frequent D&D rules questions and provide answers to them in the Sage Advice Compendium. Today we’re releasing an update to the compendium, which includes the following new material:
- Guidance on what spells qualify for the sorcerer’s Twinned Spell feature
- Links to new errata documents for Xanathar’s Guide Everything, Mordenkainen’s Tome of Foes, Out of the Abyss, and the Player’s Handbook
To find the latest rules answer, search for “[New]” in the compendium.