CF: Spell List Collection
This feature is how you add spells with the Spell Library / Prepared Spells Common Feature, or similar features.
Along with this Common feature will be an item, entity, or creature this will use to store your spells, such as a Spell Book, a familiar, or similar. This item will be your repository of spells you know from the class that grants this feature, including Cantrips.
When you gain this common feature (usually at Caster level 1), your collection starts off with a number of spells equal to 5 plus the level of the class that grants this common feature. This does not include Zeroth level spells. A GM may choose to give more or less, but only as an alternative to rules as written.
Adding a spell into your Collection/Library uses the Managing your Library Activity. Said info will be repeated.Copying a Spell into your Library
Suitable spells to add to your Collection must be of a Spell Rank you can prepare or use (via the Spell Library or Spell Repertoire common features), Once you find them all you need is the time and resources to decipher and copy them.
For each numbered rank of the spell, the process takes 1 hour and costs 10 gp per spell level (Cantrips take 10 minutes or a Swift Rest). The cost representing the material components, inks (for spellbooks), time mimicking or teaching the spell (to entities and familiars), and whatever else may go into your Spell Collection. Once done, however, can prepare these spells just like any other you have.
Replacing your Collection
You can copy a spell from your own Collection into another form of your Collection (one spelbook to another, for example, if you want to make a backup of such), This is just like copying a new spell into your Collection, but faster and easier, since you understand your own notation and already know how to cast the spell. You need spend only half the time and cost to do so.
If you lose your connection to your Collection (like losing your spellbook, having your connection severed from your familiar, etc), you can use the same procedure to transcribe the spells that you have already prepared into a new form of Collection. Filling out the remainder requires you to find new spells to do so, as normal. For this reason, many wizards keep backup spellbooks in a safe place, with those who rely on familiars need only to find a new Familiar and teach them anew.
Adding Spells to your Spell Library / Prepared Spells goes along with the this feature common feature, which you will get along with the Spell Library feature unless under different circumstances.