DnD level ups explained - Wargamer
Spellcasting – The spells you know, how many spell slots you have, and the level of spells you can cast are all affected by level ups.
Bard Spells Breakdown - Baldur's Gate 3 - RPGBOT
The number of boxes indicates how many Spell Slots (charges) you have. Here you can see there are four charges of Level 1 and three charges of Level 2 spells.
D&D 5E - Spell Slots by Class | EN World D&D & Tabletop RPG News ...
The Paladin Features table shows how many spell slots you have to cast your level 1+ spells. You regain all expended slots when you finish a Long Rest.