I had this come up last night, but I cant find it in the PHB but pretty sure I found it a few weeks back. As usual, its buried in small blurb in the PHB that makes it almost impossible to find. Im pretty sure this is the rule on the number of spell that can be cast per turn. IRC a player cant cast two slotted spells on their turn, only one and a cantrip. Does anyone know where this is located in the PHB. I looked this morning but can't find it. Am I misremembering this, as it says below there is no particular rule?
Here's the Sage Advice quote that kind of supports this
Is there a limit on the number of spells you can cast on your turn?
There’s no rule that states you can cast only X number of spells on your turn, but there are some practical limitations. The main limiting factor is your action. Many spells require an action to cast, and unless a feature says otherwise, you only have one action on your turn. You also must abide by the rule of only expending one spell slot to cast a spell on your turn.
So, for example, if you take your
Bonus Action to cast
Healing Word using a spell slot, you can also take the
Magic action to cast
Vicious Mockery—a cantrip which doesn’t require a spell slot.