Model with many allowedFields data

you mean, instead of marking allowedFields which are various you want NOTallowedFields which are fewer? 
yet i failed to find this type of thing. may be seniors will advise for proper solution, if it is a valid question.
happy learning CI4.

Newbie here in CodeIgniter World !! Please appologize if any nonsense from me.  

environment: Windows 10, XAMPP 3.3.0, VS Code, SQLyog Community Ed.