Spell Slots
The Bard table shows how many spell slots you have to cast your spells of 1st level and higher. To cast one of these spells, you must expend a slot of the spell's level or higher. You regain all expended spell slots when you finish a long rest.
For example, if you know the 1st-level spell cure wounds and have a 1st-level and a 2nd-level spell slot available, you can cast cure wounds using either slot.