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You open the DuckDuckGo website, select "Help" from the sidebar and write "syntax" into the search box: https://help.duckduckgo.com/duckduckgo-help-pages/results/sy...

The main problem I have with the syntax is that "-" doesn't remove that term from the search results. In fact I'm not sure what it does.

For example, search "cats" and "cats -adopt". The second result for me in both cases is "Cats for adoption".

That is true, no arguments against that. I merely wanted to point out that it is relatively easy to find the mentioned help page.