Active Record seems to be a function of Ruby on Rails that allows you to handle data existing in the database without writing SQL directly in Ruby on Rails.
It seems that this Active Record is used when searching data from the DB. If you understand this and become familiar with it, I feel that you can level up: fist:
For example, Active Record has something like this.
all find find_by first where pluck order distinct select group joins having
I don't think I can remember it, but I think I will unknowingly remember the ones I use often if I use Rails.