What are the criteria for understanding, familiarity and proficiency in recruitment?

There is no certain standard for this.

In fact, if you look at the words "know and be familiar with" written on a person's resume, the basic recruiter will think that you are generally less proficient in this technology and will not care about your technology.

When you see the words master and skillfully use, you will think that you belong to the general level, and you will ask or examine your mastery of basic knowledge.

Skilled vocabulary can attract the attention of recruiters. It is also the main target of the recruitment task, and will comprehensively and deeply examine you.

I have done recruitment work, and the basic basis for the investigation of technology is above. So it's best to express it truthfully in your resume. This level generally depends on your own evaluation of yourself.