I used to use cyanogen mod but have not used a custom ROM in years. How difficult is it to setup these days and how difficult will it be to adjust?

"As a global operating system, it’s important that these names are clear and relatable for everyone in the world. So, this next release of Android will simply use the version number and be called Android 10. "

https://blog.google/products/android/evolving-android-brand/

Those are internal code names only, they haven’t had public facing sweet code names since Android 9.

What were the code names for Android 10-15?