The phrase "vast knowledge" means having a very large and extensive amount of information and understanding about a particular subject. Full definition
To work as a nursing assistant, he should be a certified professional with vast knowledge of diagnostic tools and ability to understand and meet the personal needs of the patients. (bestsampleresume.com)
For this reason, only a person with vast knowledge of accounting field is recruited for this profile. (bestresumewriting.com)
There's some great information and some great contributors with vast knowledge on many topics. (biggerpockets.com)