Unity has quite some void functions already there like Start, update, awake and such, but where can I see the full list of these predefined voids? Thanks
Should give you most of them. Have a good morning!
I don't quite understand what you mean by full list but for a full list of functions and variables in MonoBehaviour (base class for scripts) check here.
If you want a full list of everything script related, check the ScriptReference for Unity specific stuff and maybe the mono documentation and the .NET framework class library for the rest.