Opt In

An article that is opt in, indicates in depth information or expansion rules that you can use in the game to for decorating or maybe to earn an additional advantage if the subject interests you. However they are not mandatory, and you will not be penalized for not using or understanding them.

Opt In: use it if it is fun, ignore it if it isn't.

Examples:

• correct Forms of Address
• Etiquette
• Preferment