CF: Spell Repertoire / Known Spells
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You have a collection of spells you know by heart or have memorized intensely. These were classically referred to as "Known Spells", but for you this is called your Spell Repertoire.
Your Spell Repertoire is a pool of spells you have equal half your Class Level, plus the Class Key Attribute of the class that gave this feature, with a minimum of 2. Each time this number increases, you learn of a new spell of your choice from the spell list(s) that assigned this common feature.
As an example, A Level 3 Sorcerer with 4 of their key attribute (commonly, INT or CHA) will have 6 spells (2+4) in their repertoire.
Managing your RepertoireOnce per day, after finishing a Long Rest or during your daily preparations, you may exchange one spell from your Repertoire with another from your spell list(s), as long as you are eligible for both.
Additional Spells from Features/TalentsCertain features will use language like 'you learn x ability...' or 'you gain x ability...'). These spells are freely added to your Repertoire and follow all the same rules as your other spells, and do not count against the maximum number of spells collected with this feature. You cannot exchange those spells while managing your repertoire.