Personal Privacy and Search Engines

How to set DuckDuckGo as preferred search engine for web browsing

(Sun Feb 24 2019 00:00:00 GMT+0200 (Eastern European Standard Time)) The browser makers and operating system makers generally make a mainstream search engine to be default, rather than DuckDuckGo or other alternatives. Using DuckDuckGo is preferred because of their promise to not track us. So, how then do we implement DuckDuckGo as the default search engine?