Are you focusing more on the themselves or trying to master the social context of when to use them?

I can also suggest or alternative textbooks like Minna no Nihongo if you prefer a different style.

Patterns used to describe when something is "easy to do" or "hard to do".

Depending on whether you are referring to the popular Japanese textbook series or the international sushi chain, here are the relevant reviews for and Genki Sushi : Genki Textbook: Chapter 19 (Honorifics) Chapter 19 of the

In the context of Japanese language learning, textbook is famously known for introducing Keigo (敬語)