2. I know all skills/technologies of xxxx.

3. Master: I have mastered the skills/technology of xxxx.

Skills: Used for general skills.

Technology: Used in science or computer.

In terms of intensity, "understanding" is not as good as "familiarity" and "familiarity" is not as good as "mastery".

Americans have five skills when they apply for a job, but they boast ten; Therefore, even if they only understand or know what level, they will use master in their resumes.

China's defensive attitude, with a score of five, is often only three, which is very unfavorable for job hunting. If you are really sure about XX technology, use master. This will be at least on the same level as competitors.