Your class gains access to all Optional Class Features found in Tasha's Cauldron of Everything. When an Optional Class Feature replaces a core feature from the book, you can choose which one to use. If it provides an additional benefit to your class, you automatically gain it.
Examples:
- Barbarians get Primal Knowledge at Level 3.
- Rangers have the option to replace Favored Enemy with Favored Foe, if desired.
- Casters have access to new/extra spells.
- Caster can replace cantrips at level 4.