I give my thoughts on how to make a good IP (Intellectual Property) and how to maintain it when you make sequels, DLCs, and other additions.
I reference my two setting and design document videos:
https://youtu.be/kW7gOPHmr-Q
https://youtu.be/ohHLUKj3NTk
I also recommend this video on the Like Stories Of Old channel:
https://youtu.be/5tmxfVWDgMM