- Terms in "quotes" still work for finding results with a certain phrase in them. (the +plus Operator used to be great for this also but Google killed that)

- AND and OR still work, as do parentheses. Very useful when combined with the above.

- before: and after: are super useful for narrowing down a result to within a certain timeframe, like before AI. (Sadly I use this all of the time)

- filetype:$EXTENSION for finding files. I used to use this and "index of" to find interesting PDFs on misconfigured web servers, but the Internet has caught on.

- -minus Operator to exclude results that contain a term. Great for excluding subreddits

- inurl:$SUBSTRING or intitle:$SUBSTRING to scope results to pages with $SUBSTRING in their URLs or page titles. Indispensable for finding people on LinkedIn, like recruiters.