I usually see "I have extensive experience" or "I have broader experience" in resume. I want to know an alternative way to express that "I have much experience and great knowledge in something"
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I usually say "extensive knowledge" about something, but you could also say "comprehensive" knowledge or experience, or perhaps "considerable" experience or knowledge.
It also helps to know the subject at hand, because there are certain descriptive words that can be used within different industries that signify your knowledge and understanding.
Though as I've understood from employers, these are fluff words that should be used sparingly; you should describe what you've done as opposed to what you think it makes you.
According to LinkedIn data, the term extensive experience comes first in the top ten overused words in résumés across the United States:
Google Ngram set on the American English Corpus confirms this trend. The following expressions are: broad experience (blue line); extensive experience (red line); considerable experience (green line) and a lot of experience (yellow).