1) intitle
This search command is to tell the search engine , The title of the search result must contain the keywords you entered.
Otherwise, sometimes your search page will also include the keywords you entered.
2)Keyword A -Keyword B
This search command is to tell the search engine that the search result cannot contain the keyword B. When using this command, a space must be added after the keyword A.
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3) filetype: file format keywords
This search command is to tell the search engine that the results will only show links whose keywords are in a certain file format.
4) site:URL p>
This search command is to tell search engines to search for this keyword only on this website.