To exclude particular websites from Bing web search API results, you can use the "NOT" operator in your search query to exclude specific domains or websites from the results.
For example, if you want to search for "best restaurants" but exclude results from Yelp, you can use the following query:
best restaurants NOT site:yelp.com
This will exclude any results from the Yelp website. You can replace "yelp.com" with any other website that you want to exclude.
Alternatively, you can also use the "-site:" operator to achieve the same result. For example:
best restaurants -site:yelp.com
This will also exclude any results from Yelp.
Note that this technique will only work for excluding results from specific domains or websites. It will not work for excluding specific pages or sections within a website.