I'm jumping back into DMing D&D after decades off, and I have some questions about the 5e multiclassing rules. Specifically, how to determine spell slots when combining a spellcaster class with the Warlock class?
One of my players wants to be a Paladin/Warlock. I'm trying to figure out if the player uses the Paladin advancement chart on pg. 83 or the multiclassing chart on pg. 165 to determine how many spell slots he should have? My confusion stems from the way Pact Magic works with multiclassing.
Basically, if you multiclass a spellcaster and Warlock does that count as 2 spellcasters (so you divide your Paladin levels by 2 rounded down for the purpose of figuring out your spell slots) or just a single spellcaster (so you use the Paladin's standard spell advancement)?
For example, a Paladin 3/Warlock 3 should have the following spell slots:
1. x3 1st level Paladin spells slots and x2 2nd level Warlock slots.
OR
2. x2 1st level Paladin spells slots and x2 2nd level Warlock slots.
OR
3. Neither, I'm totally doing this wrong.
I'm hoping you guys can help me out!

Spell Slots 5e Multiclass
5e Multiclass Spell Slots Calculator

Spell Slots 5e Multiclass

The spells must be of a level for which you have spell slots. Uplifting thought of the day. For example, if you are a 5th-level artificer, you have four 1st-level and two 2nd-level spell slots. Slots youtube mg21. With an Intelligence of 14, your list of prepared spells can include four spells of 1st or 2nd level, in any combination. In the section on multi-classing, page 163-164. Slots online slotswinxb. (The book does have an index by the by.) You can cast any spell in any spell slot of equal or greater level that your character level has access to. You are restricted to learning spells of the highest level that your class level is capable of learning.

5e Multiclass Spell Slots Calculator

Spell Slots Where 5E does a fantastic job – in my opinion – is with the Spell slots. A multiclass character gains spell slots based on the power of the casting classes they are part of. A full caster – one that can potentially learn 9th level spells – adds 1 level to the basic caster table.
Smite is key in this build. Smite benefits from high-level spell slots, which we just discussed. Warlocks won’t take a spell slot hit from multiclassing with another spellcaster, so you have plenty of high-level spell slots to use with Smite. Plus, Warlock regain spell slots with a short rest, giving you more uses of Smite than a typical Paladin.
He also ends up with only 4 spell slots (x2 1st level Paladin and x2 2nd level Warlock) as opposed to 6 if he chooses not to multiclass. On the plus side, 3 levels of Warlock give him 2 cantrips and x2 2nd level spell slots that recharge on a short rest (vs long rests for his Paladin spells I believe) for more Smiting.