Search operators for mailbox

Google https://support.google.com/mail/answer/7190?hl=en
Yahoo https://www.lifewire.com/search-messages-yahoo-1174487
Outlook https://support.microsoft.com/en-us/office/learn-to-narrow-your-search-criteria-for-better-searches-in-outlook-d824d1e9-a255-4c8a-8553-276fb895a8da
Yandex https://yandex.ru/support/mail/web/letter/query-language.html

Search operators for file storages

Google Drive https://support.google.com/vault/answer/2474474?hl=en

Search operators for OS file system

MacOS https://support.apple.com/guide/mac-help/narrow-search-results-mh15155/mac
Windows https://thegeekpage.com/windows-10-advance-search-tricks-cheatsheet/#Search_by_File_extension

Linux (find command cheat sheet) https://devhints.io/find

Search operators for search engines

Google https://www.indeed.com/career-advice/finding-a-job/google-search-operators#:~:text=Google%20Search%20operators%20are%20combinations,Punctuation%20such%20as%20quotation%20marks

Yandex (also works with Yandex Images Search) https://seosly.com/yandex-search-operators/

DuckDuckGo https://help.duckduckgo.com/duckduckgo-help-pages/results/syntax/

Bing https://seosly.com/bing-search-operators/#:~:text=Bing%20search%20operators%20are%20special,your%20online%20life%20way%20easier

Search operators for social media

Twitter https://www.tweetbinder.com/blog/twitter-advanced-search/
YouTube https://seosly.com/youtube-search-operators/
Reddit https://www.reddit.com/wiki/search/

Search operators for search professionals

Linkedin https://booleanstrings.com/linkedin-search-operators/
Github https://docs.github.com/en/github/searching-for-information-on-github/searching-on-github/searching-code

Search operators for IOT search engines

Shodan https://help.shodan.io/the-basics/search-query-fundamentals
Censys https://censys.io/ipv4/help/examples?q=&
FOFA https://fofa.so/ (click the button below search field)

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Dork collections lists

https://github.com/cipher387/Dorks-collections-list