Tiny Google Search Cheat Sheet

first of all: you can use Startpage. It is proprietary, hosted in the USA/Netherlands, and provides you with anonymized Google search results (including images).

define Returns Definition
or |
filetype: Returns only search results that match a particular file extension.
site: Returns only search results from a particular website.
to Convert measurements from one unit to another.
do a barrel roll

other Search engines: Duckduckgo, metager, ...