Source: https://ahrefs.com/blog/google-advanced-search-operators/

Working

Search operator What it does Example  
“ ” Search for results that mention a word or phrase. “steve jobs”  
OR Search for results related to X or Y. jobs OR gates  
| Same as OR: jobs gates
AND Search for results related to X and Y. jobs AND gates  
- Search for results that don’t mention a word or phrase. jobs -apple  
* Wildcard matching any word or phrase. steve * apple  
( ) Group multiple searches. (ipad OR iphone) apple  
define: Search for the definition of a word or phrase. define:entrepreneur  
cache: Find the most recent cache of a webpage. cache:apple.com  
filetype: Search for particular types of files (e.g., PDF). apple filetype:pdf  
ext: Same as filetype: apple ext:pdf  
site: Search for results from a particular website. site:apple.com  
related: Search for sites related to a given domain. related:apple.com  
intitle: Search for pages with a particular word in the title tag. intitle:apple  
allintitle: Search for pages with multiple words in the title tag. allintitle:apple iphone  
inurl: Search for pages with a particular word in the URL. inurl:apple  
allinurl: Search for pages with multiple words in the URL. allinurl:apple iphone  
intext: Search for pages with a particular word in their content. intext:apple iphone  
allintext: Search for pages with multiple words in their content. allintext:apple iphone  
weather: Search for the weather in a location. weather:san francisco  
stocks: Search for stock information for a ticker. stocks:aapl  
map: Force Google to show map results. map:silicon valley  
movie: Search for information about a movie. movie:steve jobs  
in Convert one unit to another. $329 in GBP  
source: Search for results from a particular source in Google News. apple source:the_verge  
before: Search for results from before a particular date. apple before:2007-06-29  
after: Search for results from after a particular date. apple after:2007-06-29  

Sidenote: You can also use the _ operator, which acts as a wildcard in Google Autocomplete.

Unreliable

Search operator What it does Example
#..# Search within a range of numbers. iphone case $50..$60
inanchor: Search for pages with backlinks containing specific anchor text. inanchor:apple
allinanchor: Search for pages with backlinks containing multiple words in their anchor text. allinanchor:apple iphone
AROUND(X) Search for pages with two words or phrases within X words of one another. apple AROUND(4) iphone
loc: Find results from a given area. loc:”san francisco” apple
location: Find news from a certain location in Google News. location:”san francisco” apple
daterange: Search for results from a particular date range. daterange:11278-13278