Duckduckgo is great. But also because the easy !g !gi !tw shortcuts to search in google or twitter as well. Surprised to find lately that a lot of my searches only return relevant results in a twitter search.
Also w! for wiki. The bang commands are super useful.
That's a feature of most browsers location bar. Just assign a letter/string to any bookmark of your liking and voila! No need to depend on DDG and exclamation points for your quick searches.
A few of my favorites include hn for HN's algolia, th for thesaurus, wes for Wikipedia in Spanish and d for... duck duck go.