As with other search engines, high-quality content and backlinks are the first place to start when performing SEO for DuckDuckGo searches. Expanding beyond simple keywords can also help to rank well.
DuckDuckGo doesn’t track user searches, and search results aren’t personalized. In order for a website to rank well, it must provide quality content and a great user experience. Like other search engines, DuckDuckGo uses backlinks to help determine search result rankings. Fewer high-quality backlinks are preferable to a large number of low-quality links. DuckDuckGo suggests Wikipedia as an example of a website it considers to be high quality.
Because DuckDuckGo doesn’t track users, it isn’t able to return local search results that are as accurate as some other search engines. DuckDuckGo depends on users to tell them their location, so in order to rank well locally, website owners should use terms that describe their local area. For example, businesses should include information about nearby roads and intersections, local attractions and neighborhoods.
DuckDuckGo tries to determine what the search user is asking by using context. It's therefore important for website owners to not only focus on keywords but also to use semantic search techniques to try and determine what the user is specifically looking for and trying to accomplish.