You don't need to memorize the Player’s Handbook, but knowing how your own spells work keeps the momentum alive. Nobody likes a 20-minute pause while you look up "Magic Missile" for the tenth time.
Here is your field guide to building a bridge instead of a wall: Playing Well with Others: Your Field Guide to D...
They spent hours prep-work for your session. Show up on time, put the phone away, and engage with the world they built. You don't need to memorize the Player’s Handbook,